diff --git a/backend/open_webui/retrieval/utils.py b/backend/open_webui/retrieval/utils.py
index 6140d0d45d..1119fdbce9 100644
--- a/backend/open_webui/retrieval/utils.py
+++ b/backend/open_webui/retrieval/utils.py
@@ -632,7 +632,7 @@ def merge_and_sort_query_results(query_results: list[dict], k: int) -> dict:
 
         for distance, document, metadata in zip(distances, documents, metadatas):
             if isinstance(document, str):
-                doc_hash = hashlib.sha256(document.encode()).hexdigest()  # Compute a hash for uniqueness
+                doc_hash = (metadata or {}).get(CHUNK_HASH_KEY) or _content_hash(document)
 
                 if doc_hash not in combined.keys():
                     combined[doc_hash] = (distance, document, metadata)
@@ -1335,7 +1335,7 @@ async def get_sources_from_items(
     full_context=False,
     user: UserModel | None = None,
 ):
-    log.debug(f'items: {items} {queries} {embedding_function} {reranking_function} {full_context}')
+    log.debug('items: %s %s %s %s %s', items, queries, embedding_function, reranking_function, full_context)
 
     bypass_embedding_and_retrieval = await Config.get('rag.bypass_embedding_and_retrieval')
     extracted_collections = []