MR for champs are all gone!!!

Today I logged in my account at the morning play some games and leave. After some time I log back into my account to play more games and just go into my profile and see that all my Mastery ranks for my champions are gone. I check to see if restarting will help in any way....but it didn't. Then I look up all my friends and they don't appear to have any mastery ranks too. Please if someone know what to do help me ;-;