[CLIENT] Team Builder (Only?) Masteries Bug 5.13 (May have been there before?)

So basically in team builder, if you view the profile of a friend and click on one of their mastery pages, then press the "Return to team builder lobby home" button that mastery page will now be the current one you are using in the team builder lobby. I'm not sure if it is a visual bug, or something with my client but it happens every time I try. Then if I go to change the page a message pops up saying "A Suitable error message could not be found" Also, when going to change mastery pages it will show both yours and the teammates mastery pages, sometimes combining two pages if you hover over it, it has a different name than what it says in the list without hovering over it.