[Client] Negative IP in client

After buying Alistar, my IP balance dropped into the negatives: http://gyazo.com/91eaf71e6adbc28a7d4006eb3179fbf0

What happens when I try to buy a champion after clicking on their splash in the store and then clicking unlock: http://gyazo.com/d48aea777d51932ccf7784b030cdd30a

And when I click unlock directly from the store (before clicking on their splash): http://gyazo.com/a956fd3b80282dadcdc7eeef1022d697

I originally had 1656 IP before buying Alistar (1350). I should have ended with 306 IP (as seen as my current IP in third photo.) The IP amount I'm seeing is equal to 306 (amount I should actually have) - 1350 (price of Alistar)

I was able to fix the visual issue by restarting my client, though.