[CLIENT] Masteries issue

So I was creating my masteries for different roles when I stumbled across a minor error that could turn into a bigger problem. In the "Resolve" tree when I hover over the last options ( "Key mastery" ?) the tooltip starts bouncing around and yesterday I couldn't select either one of the 3. Initially I wasn't going to post anything, as I'm sure you're aware of the problem and are working on fixing it so I went on with other masteries that do not include these 3 masteries. I started getting a "platform error" and when I join in for a game and selected either mastery page, it kept giving me that "platform error", plus the masteries were not available in-game, which is not fair considering that other players have them activated.