[GAMEPLAY] Graves "True Grit" Giving Incorrect Armor After Leveling

I play Graves jungle a lot, and noticed that if you have stacks of True Grit active, when you level up, they become 10% effective So, having four stacks at level 2 and hitting level 3 causes me to go from 40 bonus armor to 4. This happens regardless of the amount of stacks, and I've only notice it occur on level ups. I'm also not sure if it's tied to the ability being level 1, of if it universal across the skill's level.

In order to reproduce:

1. Get any number of stacks of True Grit
2. Level up.

All I've found needed to replicate.