no, it's a warband problem.
Yeh, I agree its a warband problem, but something in the latest patch has made interaction with this warband error significantly worse than it was before, possibly the flatter trajectory is making it easier for the hitboxes to not register the hit (the fact that they don't register the hit in the first place is M&B's issue). Is there any way to reduce the trouble coming from interfacing with M&B parameters? Maybe widen arrows? that might reduce hitbox non-registry.