where did my IP go

I just won a ranked game and it shows in the end that I got 76 ip but it didn't add in my total IP. :o I know it cause I was about to buy oriana and I was at 4785 IP and I'm still at 4785 IP after the game. 76 IP is not huge i'll just play another game and get it but it's still a bug and would like to know if it happened to anybody else???!!!!