I'm not 100% sure if this is an issue with this mod. I'm on Controlling-fabric-1.19-10.0+3.jar of the Controlling Mod and tried changing my shift key. I get "S +" in front of the keybind I'm using. The reset button doesn't work, and I have to redownload the mod pack, but I still can't change my shift key without getting the extra "S +..." Multiple of my friends are experiencing the exact issue too.

Realised this isn't an issue with this mod. All resolved! Thanks.