_**Edited: This only happens in rank games now.**_
I've changed several mastery before the game and saved. But when I entered a match and trying to select the new mastery, I couldn't find the new name I gave to the mastery and the preview of the mastery when I move my mouse on it is still the old one. However, when I chose the new one(with the old name and preview) and click edit, it displays the new one with the new name in editing page. So that's really confused because I can't know which (old or new) mastery I really select until I'm in the game, when it's too late to change. This happened after today's patch in every game I played today.