diff --git a/backend/routers/issues.py b/backend/routers/issues.py
index de27e1a9..28a4d844 100644
--- a/backend/routers/issues.py
+++ b/backend/routers/issues.py
@@ -186,9 +186,6 @@ async def create_issue(
             hash_content = f"{description}|{category}|{prev_hash}"
             integrity_hash = hashlib.sha256(hash_content.encode()).hexdigest()
 
-            # Update cache for next report
-            blockchain_last_hash_cache.set(data=integrity_hash, key="last_hash")
-
             # RAG Retrieval (New)
             relevant_rule = rag_service.retrieve(description)
             initial_action_plan = None
@@ -212,10 +209,16 @@ async def create_issue(
 
             # Offload blocking DB operations to threadpool
             await run_in_threadpool(save_issue_db, db, new_issue)
+
+            # Update cache only after a successful DB commit
+            blockchain_last_hash_cache.set(data=integrity_hash, key="last_hash")
         else:
             # Don't create new issue, just return deduplication info
             new_issue = None
     except Exception as e:
+        # Invalidate cache so next request re-fetches the true last hash from DB
+        blockchain_last_hash_cache.invalidate("last_hash")
+
         # Clean up uploaded file if DB save failed
         if image_path and os.path.exists(image_path):
             try: