Its very strange, my character's power attacks no longer require stamina. I can just spam them without losing any. Oddly enough sprinting still takes stamina though. I have no idea if its related but i noticed it around the same time that i picked up the lady stone (think that's the right one, the stone that improves HP/Stamina regeneration) I also have the light armor perk that increases stamina regeneration. I have no idea if that is related, but its all i can think of.

Anybody else experience this? I loaded my game up a few times; hopefully the bug just fixes itself in time and ill update if it does.