Steps to reproduce:
1. Make a physics enabled small object that will bounce.
2. Make multiple instances of said object.
3. Make a player object that spins and has physics too, with player input.
4. Turn off gravity.
5. Crash into smaller instances.
Hitting one instance with player causes all other instances to register the same effect of being hit. e.g. hit 1 and all instances are hit as well. Doesn't happen every time.
A youtube video of result, happens at 30s and 38s. Watch me hit the red square and the green squares also are hit even though they aren't near the player object.
That hitting an instance only effect the physics of the instance hit.
Internet Explorer: yes
Operating system & service pack:
Windows 7 Home Premium SP1 (64bit)
Construct 2 version:
Release 132 (64bit)