diff --git a/ATI/nodes.py b/ATI/nodes.py
index 6b94355..ceb123d 100644
--- a/ATI/nodes.py
+++ b/ATI/nodes.py
@@ -116,7 +116,7 @@ def parse_json_tracks(tracks):
             # If tracks is a list of strings, parse each one
             for track_str in tracks:
                 parsed = json.loads(track_str.replace("'", '"'))
-                tracks_data.extend(parsed)
+                tracks_data.append(parsed)
         
         # Check if we have a single track (dict with x,y) or a list of tracks
         if tracks_data and isinstance(tracks_data[0], dict) and 'x' in tracks_data[0]: