[CLIENT] TeamBuilder Mastery bug when viewing other players profile

I queued up for a teambuilder match with Twisted Fate on mid lane. I then saw a Twisted Fate being played on a featured Ranked game. I went to my profile and typed the name of the TF player so I can see his runes and masteries. I then returned back to my profile and changed my masteries and saved them. I was still on my profile when a game was found. I accepted but my masteries weren't mine. All the pages that I could select had the same name as the ones on the TF player's profile. They had been switched. Also when selecting any of the pages an error message was shown: "A suitable error message could not be found". I could change all the masteries, but I could not exit the mastery selection window to click the Ready button. I had to exit the client.

TL;DR: I was viewing a guys profile and when a game was found my masteries were changed with his, and all bugged. Hope this helps.