When I logged on, I had lost all but 90 of my 211 mastery levels. Whaah! Please help. Someone on the chat said log off and log back on, and I tried that, but it didn’t do any good. Someone else said wait and it will come back, but I waited over 30 minutes and it didn’t.
check your region settings, progress isnt shared across regions. But if its still bugged, restart your pc and try again.
it is a known issue. just go out and in, that should fix it.