Improvements

Based on the feedback I managed to fix the spawn points for the zombies. I changed the y positions  by making sure they are not too high or below the ground. Now they spawn nicely without falling below the surface. For the player rotation I tried to de-activate the rotation when the game is paused but it was not solved. To be honest it was not necessarily a bug it was more of a difficulty and would not affect my game. 

However I could not solve the shooting on trigger issue. My box collider figures are fine and even checked for solutions online. I still cannot kill some of the old zombies but can kill the new ones.