fix

app/Http/Controllers/MediaController.php

@@ -482,10 +482,14 @@ private function similarMedia(Media $media, int $limit = 5)
             'tags as tag_matches' => fn ($t) => $t->whereIn('tags.id', $tagIds ?: [0]),
         ])
         ->with(['image', 'detailImage', 'categories', 'subCategories', 'tags'])
-        ->orderByRaw('(category_matches + subcategory_matches + tag_matches) desc')
+        // Pull a recent candidate pool (portable; Postgres can't ORDER BY alias
+        // expressions), then rank by overlap in PHP.
         ->orderByDesc('created_at')
-        ->limit($limit)
-        ->get();
+        ->limit(60)
+        ->get()
+        ->sortByDesc(fn ($m) => $m->category_matches + $m->subcategory_matches + $m->tag_matches)
+        ->take($limit)
+        ->values();
 }
 
 public function rate(Request $request, $mediaId)