I think it's because.. that game is what Discord's overlay thing uses on default if it can't recognize the game perhaps since it does so using igdb (Video game data base).
You can simply manually edit the game's name in settings.
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Yeah I immediately disabled discord overlay when it first popped up which is probably why I didn't notice that. Kind of weird, I'd be concerned if it made discord show everyone you were playing a porn game, but if Poker Master just means it has no idea what game you are playing then I guess it's not a huge deal. I'd bet even if I looked into it that I probably can't do anything about it on my end since it's a discord thing. Thanks for letting me know it does that though.