Bug with choosing masteries

I've had this bug happen to me multiple times. In the spot where it says to choose your mastery it will say the wrong name of the mastery actually chosen. I've gone and chosen my mastery only to go into the game and have the wrong masteries on. It's super annoying because then I will have a harder time winning lane. I had my masteries set to tahm kench only to go into game and realize they hadn't changed.