Invisible pieces?

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Avatar of DubiousChess

Just played a bullet game, and when my opponent moved his knights out they both turned invisible. Here's the game - https://www.chess.com/game/live/13993870229?username=nathanf314

I've been playing on this site for 7 years and have never seen this happen. I would have assumed it's a glitch, but then I saw the guy is a chess.com moderator. Is this something mods are allowed to do? It seems pretty unlikely that the one time (and only time as far as I can remember) my opponent is a mod, out of thousands of games, is also the one time some of the pieces turn invisible.

Avatar of raypow
Um