diff --git a/server/utils/queries/libraryBrowseStrategy.js b/server/utils/queries/libraryBrowseStrategy.js
index 141e54a48..91e26eb23 100644
--- a/server/utils/queries/libraryBrowseStrategy.js
+++ b/server/utils/queries/libraryBrowseStrategy.js
@@ -2,7 +2,11 @@ function getTitleCursorKey() {
   return global.ServerSettings && global.ServerSettings.sortingIgnorePrefix ? 'titleIgnorePrefix' : 'title'
 }
 
-function getKeysetCursorKeys(sortBy) {
+function getKeysetCursorKeys(sortBy, collapseseries) {
+  if (sortBy === 'media.metadata.title' && collapseseries) {
+    return []
+  }
+
   if (sortBy === 'media.metadata.title') {
     return [getTitleCursorKey(), 'id']
   }
@@ -23,27 +27,15 @@ function getKeysetCursorKeys(sortBy) {
     return ['updatedAt', 'id']
   }
 
-  if (sortBy === 'progress') {
-    return ['mediaProgresses.updatedAt', 'id']
-  }
-
-  if (sortBy === 'progress.createdAt') {
-    return ['mediaProgresses.createdAt', 'id']
-  }
-
-  if (sortBy === 'progress.finishedAt') {
-    return ['mediaProgresses.finishedAt', 'id']
-  }
-
   return []
 }
 
-function getPaginationMode(pageMode, sortBy) {
+function getPaginationMode(pageMode, sortBy, collapseseries) {
   if (pageMode !== 'endless') {
     return 'offset'
   }
 
-  return getKeysetCursorKeys(sortBy).length ? 'keyset' : 'offset'
+  return getKeysetCursorKeys(sortBy, collapseseries).length ? 'keyset' : 'offset'
 }
 
 function getFamily({ mediaType, sortBy, filterGroup, collapseseries }) {
@@ -60,7 +52,7 @@ function getFamily({ mediaType, sortBy, filterGroup, collapseseries }) {
 
 function getLibraryBrowseStrategy({ mediaType, sortBy, filterGroup, pageMode, collapseseries } = {}) {
   const normalizedSort = sortBy || 'media.metadata.title'
-  const paginationMode = getPaginationMode(pageMode, normalizedSort)
+  const paginationMode = getPaginationMode(pageMode, normalizedSort, collapseseries)
 
   if (normalizedSort === 'random') {
     return {
@@ -79,7 +71,7 @@ function getLibraryBrowseStrategy({ mediaType, sortBy, filterGroup, pageMode, co
     countMode: paginationMode === 'keyset' ? 'deferred-exact' : 'exact-on-initial-page',
     deepScrollAllowed: paginationMode === 'keyset',
     tieBreaker: 'id',
-    cursorKeys: getKeysetCursorKeys(normalizedSort)
+    cursorKeys: getKeysetCursorKeys(normalizedSort, collapseseries)
   }
 }
 
diff --git a/server/utils/queries/libraryItemsBookFilters.js b/server/utils/queries/libraryItemsBookFilters.js
index 3fa2ff26e..22e99c228 100644
--- a/server/utils/queries/libraryItemsBookFilters.js
+++ b/server/utils/queries/libraryItemsBookFilters.js
@@ -353,6 +353,8 @@ module.exports = {
   getOrder(sortBy, sortDesc, collapseseries) {
     const dir = sortDesc ? 'DESC' : 'ASC'
 
+    const libraryItemIdOrder = [Sequelize.literal('libraryItem.id'), dir]
+
     const getTitleOrder = () => {
       if (global.ServerSettings.sortingIgnorePrefix) {
         return [Sequelize.literal('`libraryItem`.`titleIgnorePrefix` COLLATE NOCASE'), dir]
@@ -362,7 +364,7 @@ module.exports = {
     }
 
     if (sortBy === 'addedAt') {
-      return [[Sequelize.literal('libraryItem.createdAt'), dir]]
+      return [[Sequelize.literal('libraryItem.createdAt'), dir], libraryItemIdOrder]
     } else if (sortBy === 'size') {
       return [[Sequelize.literal('libraryItem.size'), dir]]
     } else if (sortBy === 'birthtimeMs') {
@@ -375,15 +377,15 @@ module.exports = {
       return [[Sequelize.literal(`CAST(\`book\`.\`publishedYear\` AS INTEGER)`), dir]]
     } else if (sortBy === 'media.metadata.authorNameLF') {
       // Sort by author name last first, secondary sort by title
-      return [[Sequelize.literal('`libraryItem`.`authorNamesLastFirst` COLLATE NOCASE'), dir], getTitleOrder()]
+      return [[Sequelize.literal('`libraryItem`.`authorNamesLastFirst` COLLATE NOCASE'), dir], getTitleOrder(), libraryItemIdOrder]
     } else if (sortBy === 'media.metadata.authorName') {
       // Sort by author name first last, secondary sort by title
-      return [[Sequelize.literal('`libraryItem`.`authorNamesFirstLast` COLLATE NOCASE'), dir], getTitleOrder()]
+      return [[Sequelize.literal('`libraryItem`.`authorNamesFirstLast` COLLATE NOCASE'), dir], getTitleOrder(), libraryItemIdOrder]
     } else if (sortBy === 'media.metadata.title') {
       if (collapseseries) {
         return [[Sequelize.literal('display_title COLLATE NOCASE'), dir]]
       }
-      return [getTitleOrder()]
+      return [getTitleOrder(), libraryItemIdOrder]
     } else if (sortBy === 'sequence') {
       const nullDir = sortDesc ? 'DESC NULLS FIRST' : 'ASC NULLS LAST'
       return [[Sequelize.literal(`CAST(\`series.bookSeries.sequence\` AS FLOAT) ${nullDir}`)]]
@@ -395,6 +397,8 @@ module.exports = {
       return [[Sequelize.literal(`mediaProgresses.finishedAt ${dir} NULLS LAST`)]]
     } else if (sortBy === 'random') {
       return [Database.sequelize.random()]
+    } else if (sortBy === 'updatedAt') {
+      return [[Sequelize.literal('libraryItem.updatedAt'), dir], libraryItemIdOrder]
     }
     return []
   },
diff --git a/test/server/controllers/LibraryController.largeLibraryBrowse.test.js b/test/server/controllers/LibraryController.largeLibraryBrowse.test.js
index c4338ca95..337db5e2d 100644
--- a/test/server/controllers/LibraryController.largeLibraryBrowse.test.js
+++ b/test/server/controllers/LibraryController.largeLibraryBrowse.test.js
@@ -5,6 +5,7 @@ const sinon = require('sinon')
 const Database = require('../../../server/Database')
 const LibraryController = require('../../../server/controllers/LibraryController')
 const libraryFilters = require('../../../server/utils/queries/libraryFilters')
+const { getLibraryBrowseStrategy } = require('../../../server/utils/queries/libraryBrowseStrategy')
 const libraryItemsBookFilters = require('../../../server/utils/queries/libraryItemsBookFilters')
 const libraryItemsPodcastFilters = require('../../../server/utils/queries/libraryItemsPodcastFilters')
 
@@ -226,4 +227,93 @@ describe('LibraryController large-library browse contract', () => {
     expect(countStub.called).to.equal(false)
     expect(findAndCountAllStub.called).to.equal(false)
   })
+
+  it('falls back to offset mode for endless progress browse because null-aware keyset is unsupported', () => {
+    const strategy = getLibraryBrowseStrategy({
+      mediaType: 'book',
+      sortBy: 'progress',
+      filterGroup: 'progress',
+      pageMode: 'endless'
+    })
+
+    expect(strategy.paginationMode).to.equal('offset')
+    expect(strategy.countMode).to.equal('exact-on-initial-page')
+    expect(strategy.deepScrollAllowed).to.equal(false)
+  })
+
+  it('falls back to offset mode for collapsed-series endless title browse because the SQL sort key differs', () => {
+    global.ServerSettings = { sortingIgnorePrefix: true }
+
+    const strategy = getLibraryBrowseStrategy({
+      mediaType: 'book',
+      sortBy: 'media.metadata.title',
+      filterGroup: 'series',
+      pageMode: 'endless',
+      collapseseries: true
+    })
+
+    expect(strategy.paginationMode).to.equal('offset')
+    expect(strategy.countMode).to.equal('exact-on-initial-page')
+  })
+
+  it('adds a deterministic libraryItem.id tie-breaker for keyset title browse with duplicate titles', async () => {
+    global.ServerSettings = { sortingIgnorePrefix: true }
+
+    const countStub = sinon.stub(Database.bookModel, 'count').resolves(123)
+    const findAndCountAllStub = sinon.stub(Database.bookModel, 'findAndCountAll').resolves({ rows: [], count: 123 })
+    const findAllStub = sinon.stub(Database.bookModel, 'findAll').resolves([
+      { id: 'book-1', title: 'Alpha', libraryItem: { id: 'item-1', titleIgnorePrefix: 'Alpha', dataValues: { titleIgnorePrefix: 'Alpha' } } },
+      { id: 'book-2', title: 'Alpha', libraryItem: { id: 'item-2', titleIgnorePrefix: 'Alpha', dataValues: { titleIgnorePrefix: 'Alpha' } } },
+      { id: 'book-3', title: 'Beta', libraryItem: { id: 'item-3', titleIgnorePrefix: 'Beta', dataValues: { titleIgnorePrefix: 'Beta' } } }
+    ])
+
+    const result = await libraryItemsBookFilters.getFilteredLibraryItems(
+      'lib_1',
+      { id: 'user_1', canAccessExplicitContent: true, accessAllTags: true },
+      null,
+      null,
+      'media.metadata.title',
+      false,
+      false,
+      [],
+      2,
+      0,
+      false,
+      { pageMode: 'endless' }
+    )
+
+    expect(result.paginationMode).to.equal('keyset')
+    expect(result.nextCursor).to.be.a('string')
+    expect(findAllStub.firstCall.args[0].order[1][0].val || findAllStub.firstCall.args[0].order[1][0]).to.include('libraryItem')
+    expect(findAllStub.firstCall.args[0].order[1][0].val || findAllStub.firstCall.args[0].order[1][0]).to.include('id')
+    expect(countStub.calledOnce).to.equal(true)
+    expect(findAndCountAllStub.called).to.equal(false)
+  })
+
+  it('uses offset fallback for progress browse requests with null-valued sort fields', async () => {
+    const countStub = sinon.stub(Database.bookModel, 'count').resolves(123)
+    const findAllStub = sinon.stub(Database.bookModel, 'findAll').resolves([])
+    const findAndCountAllStub = sinon.stub(Database.bookModel, 'findAndCountAll').resolves({ rows: [], count: 7 })
+
+    const result = await libraryItemsBookFilters.getFilteredLibraryItems(
+      'lib_1',
+      { id: 'user_1', canAccessExplicitContent: true, accessAllTags: true },
+      'progress',
+      'in-progress',
+      'progress',
+      true,
+      false,
+      [],
+      20,
+      0,
+      false,
+      { cursor: 'cursor-2', pageMode: 'endless' }
+    )
+
+    expect(result.paginationMode).to.equal('offset')
+    expect(result.countMode).to.equal('exact-on-initial-page')
+    expect(findAndCountAllStub.calledOnce).to.equal(true)
+    expect(findAllStub.called).to.equal(false)
+    expect(countStub.called).to.equal(false)
+  })
 })
diff --git a/test/server/utils/libraryBrowseStrategy.test.js b/test/server/utils/libraryBrowseStrategy.test.js
index c8a218a8f..bf47355ed 100644
--- a/test/server/utils/libraryBrowseStrategy.test.js
+++ b/test/server/utils/libraryBrowseStrategy.test.js
@@ -64,7 +64,7 @@ describe('libraryBrowseStrategy', () => {
     expect(strategy.cursorKeys).to.deep.equal(['createdAt', 'id'])
   })
 
-  it('uses keyset pagination for progress browse', () => {
+  it('falls back to offset pagination for progress browse because null-aware keyset is unsupported', () => {
     const strategy = getLibraryBrowseStrategy({
       mediaType: 'book',
       sortBy: 'progress',
@@ -73,8 +73,8 @@ describe('libraryBrowseStrategy', () => {
     })
 
     expect(strategy.family).to.equal('progress-browse')
-    expect(strategy.paginationMode).to.equal('keyset')
-    expect(strategy.cursorKeys).to.deep.equal(['mediaProgresses.updatedAt', 'id'])
+    expect(strategy.paginationMode).to.equal('offset')
+    expect(strategy.cursorKeys).to.deep.equal([])
   })
 
   it('uses keyset pagination for updated browse', () => {
@@ -120,7 +120,7 @@ describe('libraryBrowseStrategy', () => {
     expect(strategy.cursorKeys).to.deep.equal(['authorNamesLastFirst', 'title', 'id'])
   })
 
-  it('uses keyset pagination for progress created-at browse', () => {
+  it('falls back to offset pagination for progress created-at browse because null-aware keyset is unsupported', () => {
     const strategy = getLibraryBrowseStrategy({
       mediaType: 'book',
       sortBy: 'progress.createdAt',
@@ -129,11 +129,11 @@ describe('libraryBrowseStrategy', () => {
     })
 
     expect(strategy.family).to.equal('progress-browse')
-    expect(strategy.paginationMode).to.equal('keyset')
-    expect(strategy.cursorKeys).to.deep.equal(['mediaProgresses.createdAt', 'id'])
+    expect(strategy.paginationMode).to.equal('offset')
+    expect(strategy.cursorKeys).to.deep.equal([])
   })
 
-  it('uses keyset pagination for progress finished-at browse', () => {
+  it('falls back to offset pagination for progress finished-at browse because null-aware keyset is unsupported', () => {
     const strategy = getLibraryBrowseStrategy({
       mediaType: 'book',
       sortBy: 'progress.finishedAt',
@@ -142,8 +142,8 @@ describe('libraryBrowseStrategy', () => {
     })
 
     expect(strategy.family).to.equal('progress-browse')
-    expect(strategy.paginationMode).to.equal('keyset')
-    expect(strategy.cursorKeys).to.deep.equal(['mediaProgresses.finishedAt', 'id'])
+    expect(strategy.paginationMode).to.equal('offset')
+    expect(strategy.cursorKeys).to.deep.equal([])
   })
 
   it('defines a filtered browse family for generic library filters', () => {
@@ -180,6 +180,22 @@ describe('libraryBrowseStrategy', () => {
     expect(strategy.family).to.equal('collapsed-series-browse')
   })
 
+  it('falls back to offset for collapsed-series endless title browse', () => {
+    global.ServerSettings = { sortingIgnorePrefix: true }
+
+    const strategy = getLibraryBrowseStrategy({
+      mediaType: 'book',
+      sortBy: 'media.metadata.title',
+      filterGroup: 'series',
+      pageMode: 'endless',
+      collapseseries: true
+    })
+
+    expect(strategy.family).to.equal('collapsed-series-browse')
+    expect(strategy.paginationMode).to.equal('offset')
+    expect(strategy.cursorKeys).to.deep.equal([])
+  })
+
   it('defines a podcast browse family', () => {
     const strategy = getLibraryBrowseStrategy({
       mediaType: 'podcast',