Is this done in UE4?

In level 29 I'm seeing bizzare things that defy what I believe the physics of the game should be. I launch the ball the same way each time but I get more than 1 resulting trajectory. The devience of the trajectory is significant making a game of logic into a game of random chance. The ball has also on at least one occaission "stuck" to the wall --- following the wall back and forth from one side to the other endlessly after the ball initially hits the wall at an angle! Should I just give up now?...