Happens to me all the time, idk. I have the same issue too. I just refresh and that usually doesn't work.
Cancelling Premoves on Mobile

Does anyone know how to cancel premoves on mobile? Thanks
On the app, just click somewhere else.
https://support.chess.com/article/642-what-are-premoves-and-how-do-they-work
Explained at the bottom of that. On mobile web, the only ways I know of is a refresh on the older interface and toggling premoves to off, which isn't very easy to do now, at least quickly enough.
Does anyone know how to cancel premoves on mobile? Thanks