Player that Doesn't Exist Bats for my Team? (Photo)

Well, I have never seen this one before. I just had a card that doesn't exist in the game or maybe even in history, bat for me team. G. Mists. This is after the recent site fix. Can anyone explain this? Check it out here: https://postimg.cc/62QpsjBW

pbp says that was George Sisler

https://365.strat-o-matic.com/game/play ... 461528/425