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All champs rating down by 2-4k due to mastery issue

Is anyone else facing the same issue, Since the update to mastery, all champs rating is reduced by 2-4k.
When you switch at times the rating again increase but after a while it's down by 2-4k again, for example my doctor doom who is at 31k is down to 27k rating.
When you switch at times the rating again increase but after a while it's down by 2-4k again, for example my doctor doom who is at 31k is down to 27k rating.
4
Comments
there is a mastery bug and they are fixing it