Fiora passive + ult weaknesses not being destroy properly when hit.
When attacking a weakness point on a target, Fiora must hit directly in the center of the weakness point. if hit on the sides of the weakness point the weakness point doesn't break and deals no damage.
http://i.imgur.com/goj6CW1.png
The small dots are there to represent were you have to hit the weakness spot, and the larger lines are there to show you where you cannot hit them, or else they don't proc! I am pretty sure this is unintended.