Trials of bull..

During trials of sersemas, one of the rooms was blood chalise mod, and one of the monsters was this ghostly form snake with "proximity" something modifier. My minions refused to target the enemy at any range. Simmilar crap happens all the time with other stuff(skills, game mechanics etc..)
I dont mind difficulty, but difficulty for the sake of difficulty is proven to be very bad game design, you should know this by now. Is anyone playtesting this before releasing?