Weird buying RP bug

Sadly I didnt get a screenshot as I didnt think this would happen but I bought 10 dollars of RP and it told me it had an error. Some kind of timeout or whatever so I said whatevs I'll just do it again and I did. This time it worked but when I looked it had done the 10 dollar RP twice. TBH I dont really mind cause I was considering getting 3 skins from the recent sale but this could really mess someone else up if it happens to them.