Hello. Since i reached acrobatic skill at 50 when i go sneak i always strike power attack no matter if i hold mouse or not. How to fix this?

What platform? Running any mods?

pc, no mods, path 1.2

Do you actually do the Power attack? Or, is it a critical strike?

power attack

That's weird. No idea why it would do that...... Could try changing the background mouse variable in the oblivion.ini, (to the opposite of what it is now...) and see if that makes any difference.

What kind of mouse? (although, given that it does it with the attack key as well, I doubt either solution is going to be of much help.)