[Client] New champ purchase bug

Went to purchase Thresh last night (02/09/16) and instead had Kalista unlocked. Refunded Kaiista, bought Thresh again (supposing i may have misclicked the champ). After that I had only Kalista still for a little while. A few minutes later I checked again and had both champions unlocked while only having spent 6,300 IP. A few hours later all seems well, I only have Thresh. Not sure if this can be replicated as I do not want to spend the IP to try again. Thanks for reading.