Team Builder Gameplay/Client im not sure what it would fall under.

When me a couple of friends had been playing team builder today i looked at the summoner Riot DoomHammers profile while in the lobby. After this happened whilst i was looking at my masteries they changed on me to Riot DoomHammers masteries ( It copied the name and the points ). After this happened i asked everyone in my team builder to do the same and we all came up with the same bug happening every time. The easiest way to fix this problem is going back and looking at your masteries.

Any ideas whats causing this?