Do not connect already connected replies

boards/models/post/__init__.py

@@ -347,6 +347,8 def connect_replies(instance, **kwargs):
         try:
             referenced_post = Post.objects.get(id=post_id)
 
+            # Connect only to posts that are not connected to already
+            if not referenced_post.referenced_posts.filter(id=instance.id).exists():
             referenced_post.referenced_posts.add(instance)
             referenced_post.last_edit_time = instance.pub_time
             referenced_post.build_refmap()