diff --git a/boards/models/thread.py b/boards/models/thread.py
--- a/boards/models/thread.py
+++ b/boards/models/thread.py
@@ -282,25 +282,41 @@ class Thread(models.Model):
     def get_reply_tree(self):
         replies = self.get_replies().prefetch_related('refposts')
         tree = []
-        parent_positions = {}
         for reply in replies:
             parents = reply.refposts.all()
+
             found_parent = False
+            searching_for_index = False
+
             if len(parents) > 0:
                 index = 0
+                parent_depth = 0
+
+                indexes_to_insert = []
+
                 for depth, element in tree:
                     index += 1
+
+                    # If this element is next after parent on the same level,
+                    # insert child before it
+                    if searching_for_index and depth <= parent_depth:
+                        indexes_to_insert.append((index - 1, parent_depth))
+                        searching_for_index = False
+
                     if element in parents:
                         found_parent = True
-
-                        offset_under_parent = parent_positions.get(element, 1)
-                        tree.insert(index + offset_under_parent - 1, (depth + 1, reply))
-
-                        # Move whole parent tree by 1 added element
-                        for parent in parents:
-                            parent_positions[parent] = parent_positions.get(parent, 1) + 1
+                        searching_for_index = True
+                        parent_depth = depth
 
             if not found_parent:
                 tree.append((0, reply))
+            else:
+                if searching_for_index:
+                    tree.append((parent_depth + 1, reply))
+
+                offset = 0
+                for last_index, parent_depth in indexes_to_insert:
+                    tree.insert(last_index + offset, (parent_depth + 1, reply))
+                    offset += 1
 
         return tree