Do you have any mods?
Please explain the issue is in as much detail as possible:
When a character use a rapier or an estoc weapon he makes a weird battle stance with an arm lift up and the body completely straight. I am definitively sure that this is not suppose to happen.
The hand holding the weapon stands upright, The other hand is lifted like a bare hand. I think each is programmed separately. And i don’t think upright is the right stance.