Pricing Bug in Shop

The Marble Malphite skin is priced at 520 RP, but when i purchased it i lost nearly twice as much RP. I believe that means it is coded as costing ~975 RP. I refunded the purchase to make certain I was not imagining anything. When refunding the skin, i went from ~690 RP to 1650 RP, even though it claimed to have refunded me 520 RP. If this is truly a bug, hopefully my report was helpful.