There was a recent glitch that they were working on fixing, from what I understand. You might open a ticket to see if it is related.
https://support.chess.com/customer/portal/emails/new
Standard rating incorrect
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Jan 7, 2017
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#3
I've opened a ticket but now I'm beginning to suspect this was an intentional adjustment for the Pro Chess League. My son will be playing in it and I understand they'll be using the September FIDE rating. 1818 was my son's FIDE rating in September.
This is on behalf of my son, an NM who uses this account to play and do tactics. He is wondering why his standard rating is now showing 1818 when it was 1979 after his last live chess standard game just a couple of days ago? A glitch in the system? Thanks.