[Client / Store] 1RP Purchase Bug

I purchased some RP so that I could buy a skin on the store, after buying the RP (450, giving me a total of 554) and the skin (Nightblade Irelia) which was meant to cost 520 RP, I still had 553 RP.

Although I did not attempt to actually purchase anything else as I knew that I shouldn't have had as much RP as I did. I looked at another skin that also cost 520 RP, and it said on the purchase screen that I would have enough RP to buy the item.

After playing a single match, my RP did then go down to 33.