The random champs are because they need to be in the scene at least once. Probably is too near to the play field. ^^
Glitching over walls ist a problem with a few champions, when they dash. Especially over smaller walls like the top.
Oh and the turret laser destroys itself too late somehow... I had this bug quite a while already but always had more important things to fix, so I always forgot about it. Sorry for the few updates, I am taking a small break. When my motivation for the game is back up, I'll want to update it again!