Straight from the desk of the design team:

"We are aware of the problem with some melee weapons that cause you to alternate between weapon damage and fist damage. The cause of the problem has been identified. The next step is to implement a fix, and after that to test it properly.
We expect to release a patch that takes care of this problem early next week."


Sorry for the inconvenience this has caused, guys. I know its a pain, but thank you for your patience and help in reporting this. You'll soon be slicing up those mutants as you should be.