Huh never seen or herd of anything like that, the only weird glitch I encountered was if you check my daily games if someone challenges me, it makes a lot of them if I accept
Weirdest Glitch Yet

I didn't premove anything. I just attempted to play nf3 after c5, the game froze, and then I see he played g6 and bg7. Wouldn't bring my knight back to g1!

Unless maybe I kept trying to make the move and it registered it as knight back to g1?? From clicking on the two squares again?

You could probably report this in the chess.com beta, it has a higher chance of getting a response from staff
https://www.chess.com/analysis/game/live/94095753877?tab=review
When this game started there was severe lag. Usually that only lasts for the 1st move but this time it lasted to the 2nd move. When I tried to play ng1-f3 there was a long freeze, and after it ended my opponent had made 4 moves! I looked at the game notation and it said I then played knight back to g1 and then back to f3 which I didn't do! I just tried to play 2. Nf3. What the?