Chess.com clock flaw.


There are occasional bugs and server issues. Chess.com is a little fussy in general, but these articles might help. Could be something simple...
https://support.chess.com/customer/en/portal/articles/1444849-why-did-the-clock-times-suddenly-change-the-clocks-seem-broken-
and



I stopped playing here and instead play all live chess, including tournaments, on ICC because yeah ...there are clock issues, bugs in V3 that I hadn't noticed until I had used it for some time, and technically it just can't compare to the Blitzin client. More tournaments, better competition, lag handled properly, all the GM's, etc, etc. What else do you need?
Hopefully Chess.com can work out these issues over time. Although it is getting ridiculous that V3 is as late as it is and yet V2 still has bugs galore. Not good Chess.com. Not good at all. Maybe less Danny Rensch vs The Machete and more tech support/coding/improvement to the live chess.

Are you playing on iOS? If so, force stop the app, that should fix it. I know that was a problem in some older versions but I don't know if they have tracked down the root cause and fixed it.