Editing Masteries in Champ Select not showing up in game.

So the past couple games where I've decided to change my Masteries a little bit during champ select, I've ended up in game with a different page than the one I was editing. Not merely the page I was editing without the changes but an entirely separate page.

It's not simply a matter of not editing in time, because I get the confirmation that changes have been saved. Although in the most recent game where this happened, I wasn't able to close the mastery page entirely before the game started, I'm fairly certain I did in the previous game where it happened. Never had this happen before the recent changes. Before, so long as you hit the save button, you'd have your changes, and if not, you'd have the last iteration of the page you were attempting to edit.