Stuck on instances of objects.. again

This seems like it happens for every project I do, I am trying to have several identical objects behave independent but I get into problems. Could someone please take a look at this example and see what is wrong? It is inconsistent as it is now. What is supposed to happen is the actives are bouncing around and when they collide with a red ball the red ball should be attached to the active. However it does not always work right. Sometimes an active collide with a ball, but the ball gets attached to another active that is not colliding etc.

I am using the excellent "frame step widget" (sorry don't remember who made it) so you can press "Page up" to pause and then go frame by frame by pressing the button again (or holding it) to see better what is happening.

It is so annoying and I cant seemt o see what is wrong and there are very few events :/ And as I said it is inconsistent, so you may have to run the example 3-4 times to see that things does not always works as it should. Sometimes it works, sometimes not.

When in doubt, add a foreach XD

Attachment 17365

You were spotting the fact that some diamonds sometimes were getting multiple redballs, correct?
Seems more solid now... but stress-test to be sure.

A really great widget indeed, didn't know about that.
Pure gold for debugging!