Whoops - missed that part. If you run the project and click, the black oval doesn't do much, it keeps moving towards x 300, y 300. That's the bugged behavior.
It's supposed to act like it was hit backward at an angle from 300, 300 when you click, sliding backwards and decelerating before moving forwards again.
To get it to act like its supposed to, do any one of the three things mentioned in the .capx. Then upon clicking it acts properly.
Disabling action 2 of event 3 makes it so there's only one instance in the layout instead of two. The number of instances shouldn't matter.
Moving event 19 out of the group certainly shouldn't make any difference, as it's still basically at the same level.
Condition two of event 20 being enabled or disabled shouldn't make any difference either because it's the same as the condition of event 15, and the object has already been filtered based upon that condition.
None of those things should make a difference, yet they affect the behavior.