I chain pushed one of my opponent's players onto the ball. Instead of the ball scattering as it should have, he got to pick it up with a +1 bonus.

Obviously, I would have pushed the player if I had known he would get a free shot at picking it up.

I can confirm this bug. I just tried it in Hot Seat and the pushed opposing player gets to try to pick up the ball even though the ball should just bounce according to the Blood Bowl Competition Rules.