Missing RP?

So I've had about 300ish RP sitting in my account, and when I saw Thresh was on sale I bought 10 bucks worth of RP to buy him. When I bought the RP I was at about 1.7k total. I bought Thresh for 487 RP, and it said I would be down to about 1.2k RP. But I just looked at my RP after the purchase and I'm down to 764? It was as if I got charged full price even though on the client it says that Thresh is currently 487 RP. Any assistance with this would be great, thank you.
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