diff --git a/app/src/main/java/eu/kanade/domain/chapter/interactor/GetMergedChapterByMangaId.kt b/app/src/main/java/eu/kanade/domain/chapter/interactor/GetMergedChapterByMangaId.kt
index 5f1dacc85..c03679390 100644
--- a/app/src/main/java/eu/kanade/domain/chapter/interactor/GetMergedChapterByMangaId.kt
+++ b/app/src/main/java/eu/kanade/domain/chapter/interactor/GetMergedChapterByMangaId.kt
@@ -41,7 +41,6 @@ class GetMergedChapterByMangaId(
         }
     }
 
-    // TODO more chapter dedupe
     fun transformMergedChapters(mangaReferences: List<MergedMangaReference>, chapterList: List<Chapter>, dedupe: Boolean): List<Chapter> {
         return if (dedupe) dedupeChapterList(mangaReferences, chapterList) else chapterList
     }
@@ -49,7 +48,7 @@ class GetMergedChapterByMangaId(
     private fun dedupeChapterList(mangaReferences: List<MergedMangaReference>, chapterList: List<Chapter>): List<Chapter> {
         return when (mangaReferences.firstOrNull { it.mangaSourceId == MERGED_SOURCE_ID }?.chapterSortMode) {
             MergedMangaReference.CHAPTER_SORT_NO_DEDUPE, MergedMangaReference.CHAPTER_SORT_NONE -> chapterList
-            MergedMangaReference.CHAPTER_SORT_PRIORITY -> chapterList
+            MergedMangaReference.CHAPTER_SORT_PRIORITY -> dedupeByPriority(mangaReferences, chapterList)
             MergedMangaReference.CHAPTER_SORT_MOST_CHAPTERS -> {
                 findSourceWithMostChapters(chapterList)?.let { mangaId ->
                     chapterList.filter { it.mangaId == mangaId }
@@ -71,4 +70,38 @@ class GetMergedChapterByMangaId(
     private fun findSourceWithHighestChapterNumber(chapterList: List<Chapter>): Long? {
         return chapterList.maxByOrNull { it.chapterNumber }?.mangaId
     }
+
+    private fun dedupeByPriority(mangaReferences: List<MergedMangaReference>, chapterList: List<Chapter>): List<Chapter> {
+        val sortedChapterList = mutableListOf<Chapter>()
+
+        var existingChapterIndex: Int
+        chapterList.groupBy { it.mangaId }
+            .entries
+            .sortedBy { (mangaId) ->
+                mangaReferences.find { it.mangaId == mangaId }?.chapterPriority ?: Int.MAX_VALUE
+            }
+            .forEach { (_, chapters) ->
+                existingChapterIndex = -1
+                chapters.forEach { chapter ->
+                    val oldChapterIndex = existingChapterIndex
+                    if (chapter.isRecognizedNumber) {
+                        existingChapterIndex = sortedChapterList.indexOfFirst {
+                            it.isRecognizedNumber && it.chapterNumber == chapter.chapterNumber && // check if the chapter is not already there
+                                it.mangaId != chapter.mangaId // allow multiple chapters of the same number from the same source
+                        }
+                        if (existingChapterIndex == -1) {
+                            sortedChapterList.add(oldChapterIndex + 1, chapter)
+                            existingChapterIndex = oldChapterIndex + 1
+                        }
+                    } else {
+                        sortedChapterList.add(oldChapterIndex + 1, chapter)
+                        existingChapterIndex = oldChapterIndex + 1
+                    }
+                }
+            }
+
+        return sortedChapterList.mapIndexed { index, chapter ->
+            chapter.copy(sourceOrder = index.toLong())
+        }
+    }
 }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/merged/EditMergedSettingsHeaderAdapter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/merged/EditMergedSettingsHeaderAdapter.kt
index cf284e673..7f1d8a22e 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/merged/EditMergedSettingsHeaderAdapter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/merged/EditMergedSettingsHeaderAdapter.kt
@@ -43,7 +43,7 @@ class EditMergedSettingsHeaderAdapter(private val state: EditMergedSettingsState
                 android.R.layout.simple_spinner_item,
                 listOfNotNull(
                     itemView.context.getString(R.string.no_dedupe),
-                    itemView.context.getString(R.string.dedupe_priority).let { null },
+                    itemView.context.getString(R.string.dedupe_priority),
                     itemView.context.getString(R.string.dedupe_most_chapters),
                     itemView.context.getString(R.string.dedupe_highest_chapter),
                 ),
@@ -54,9 +54,9 @@ class EditMergedSettingsHeaderAdapter(private val state: EditMergedSettingsState
                 binding.dedupeModeSpinner.setSelection(
                     when (it.chapterSortMode) {
                         MergedMangaReference.CHAPTER_SORT_NO_DEDUPE -> 0
-                        /*MergedMangaReference.CHAPTER_SORT_PRIORITY -> 1*/
-                        MergedMangaReference.CHAPTER_SORT_MOST_CHAPTERS -> 1
-                        MergedMangaReference.CHAPTER_SORT_HIGHEST_CHAPTER_NUMBER -> 2
+                        MergedMangaReference.CHAPTER_SORT_PRIORITY -> 1
+                        MergedMangaReference.CHAPTER_SORT_MOST_CHAPTERS -> 2
+                        MergedMangaReference.CHAPTER_SORT_HIGHEST_CHAPTER_NUMBER -> 3
                         else -> 0
                     },
                 )
@@ -70,9 +70,9 @@ class EditMergedSettingsHeaderAdapter(private val state: EditMergedSettingsState
                 ) {
                     state.mergeReference?.chapterSortMode = when (position) {
                         0 -> MergedMangaReference.CHAPTER_SORT_NO_DEDUPE
-                        /*1 -> MergedMangaReference.CHAPTER_SORT_PRIORITY*/
-                        1 -> MergedMangaReference.CHAPTER_SORT_MOST_CHAPTERS
-                        2 -> MergedMangaReference.CHAPTER_SORT_HIGHEST_CHAPTER_NUMBER
+                        1 -> MergedMangaReference.CHAPTER_SORT_PRIORITY
+                        2 -> MergedMangaReference.CHAPTER_SORT_MOST_CHAPTERS
+                        3 -> MergedMangaReference.CHAPTER_SORT_HIGHEST_CHAPTER_NUMBER
                         else -> MergedMangaReference.CHAPTER_SORT_NO_DEDUPE
                     }
                     xLogD(state.mergeReference?.chapterSortMode)