War Banner Bugged?

I have 2,228 accuracy, and when I activate my war banner aura I should get 15% increased accuracy right? Or is that only when placed? Cause my accuracy hasn't changed at all, seems bugged.

EDIT: Only level 1 does nothing, after leveling it to level 2 the accuracy change applied, it seems that level 1 does nothing and is bugged.

You gain accuracy just by activating the aura, and should gain more after placing with increased stages. Seems to work fine in my hideout with a level 1 gem.