I wonder if the GM’s playing also have time issues🤔?
Location of the client in respect to the server is going to have a big impact. The site only allows a certain amount of lag, so if the route between your client and the site exceeds what's allowed, you'll potentially have issues.
https://support.chess.com/article/423-why-did-the-clock-times-suddenly-change-the-clocks-seem-broken
I wonder if the GM’s playing also have time issues🤔?