Hi! How do you mean glitchy? Without more information all I can tell you is you may try launching the game after connecting all your controllers, rather than connecting your controllers while the game is already running.
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I'm sorry, you're right.
So we used a Mayflash Gamecube adapter, and the other players were not able to use their cursor most of the time, but when they could, they cursor would work fine on the bottom of the screen, but on the top, it would only let them pick Rose. Even then, the confirm button didn't work either. We thought it was because it didnt support the Mayflash adapter, so we ran it through steam by choosing "add a non steam game" so we could use a Switch controller, but we ran into the same exact issue. Every time the controllers were plugged in before we turned the game on.
The controller did work in the player one slot, so we tried using keyboard for player two, and it ended up working fine, but that still meant someone had to drive with a keyboard.