IP Display Glitch

I bought some good ol' runes, and was like, "Oh, guess I'm all out now since I've used all the IP I can use." Then a little later I looked up and my IP said 1217 so I was all "Oh I must've miscounted. Guess I'll go buy some more or this is a bug." It's a bug. It says I still have the IP I had before purchase as if the purchase never happened, but when I went to buy something else it lists my actual IP.