Bug in Character Buying Page?

Hey guys, I went to the store today with 560 influence points. I decided to buy soraka and I did, but after buying, it didn't update by balance. So, to check, I bought sivir as well, and that transaction went through too! I mean, it was cool that I now have 2 champs for the price of one, but can this be a bug that can be exploited in other ways? What are your thoughts?