This may sound odd, but we actually intended this oddity of a mechanic.
If you turn the magnet with your mouse before it attaches, you can have it cover your mech and shoot in multiple directions instead of just the one. This was inspired by a previous idea, where we were about to have weapons attach themselves onto the mech to fit the join together theme. And the catch would be that they can stick onto the head of the mech, but you can barely control where they're aiming at.
I understand why people may not like this mechanic though. I hope it's not too frustrating though.