You're probably being hacked by the American Government, who wants to ruin your chess career. I'd sue them, and bring this to the Supreme Court if I was you...
No, but in all seriousness, it could be a problem with you computer. If this happens on multiple computers, I'd suggeset reporting it to the Chess.com staff, but otherwise, I'd just see if you can find what the problem is with the computer that you're using.
Good games!
~DeepBlueCHS
I've had a few games in the past couple days where the other player will make a move and then one of my pieces will immediately move without me moving it. Sometimes pieces flash before it happens. At first I thought maybe it was a misclick but it happened a couple times where my cursor wasn't even on the board.. A lot of the times they're coupled with interrupted connections and I've had at least two games where the connection was interrupted and I didn't get any credit for a win or loss. One of those games the other player abandoned the game, the time ran out and then it gave me a "connection interrupted" and no win.