Fairly significant Graves bug

Leveling "Quick Draw" while you have active stacks causes ALL stacks to fall off (it will still say you have 4 stacks, but your armour and magic resist won't be increased at all) and it becomes impossible to regain stacks of true grit until you let your current stacks fall off. While it's easy enough to reset your stacks, in the middle of a team fight, or during a jungle route, it can be fairly detrimental.