Lost LP after a Victory

I just played a ranked game in which the opposing team ff20'd. I was at 84 LP going into the game, and the games stats page say i had earned 13 LP as it was in green with no negative. Once i exited I checked my profile and i only had 71 LP which means that 13 points were deducted from my total. How do i get this resolved as every point counts when you are trying to crawl out of Bronze...