Masteries at champ select are bugged

Please for sake of all games fix the god dam mastery pages. Every time im in champ select and trying to delete or create new pages the alpha client bugs out and doesnt register any changes I included a link to a red mercy video where at 13:01 the situation occurs. I tried tweeting to support on twitter but they spam u with the auto "its your connection", like no its not fix the damm client I have downgraded back to the legacy and hope they don't make use use that garbage until its fixed