"Bounce" Behavior Not Working Properly? - Uploaded Full Project - Please Help!

Hi,

Have one major issue before I can finish my first small game with GDevelop:

With the “Bounce” behavior, when two same objects collide only one bounces?
The other object does not bounce properly?

You can view the demo and download the project below on Itch site:

Any help would be appreciated, thanks!

Jesse Lee