This sounds like a simple picking problem..
You aren't just picking the one chest in your events so the actions are performed on all..
If you could give a screenshot of the relevant events on your event sheet or share your capx it would be much easier to explain how to get it right..
nice one, you answered my question in this haha
i played around with the pick instances and got it working with pick overlapping point, mouse.x , mouse.y
Thanks alot