When I use the Nintendo Switch Pro Controller, I am not able to sprint and my walking speed is decreased slightly. Every other input works perfectly.

I've recently written some guides on different methods of connecting controllers and troubleshooting issues. In this particular case, I recommend checking out the DS4Windows or GlosSI method. I am closing this issue due it being quite old and most likely resolved reading the guides.
https://mrcrayfish.gitbook.io/controllable-documentation/guides/how-to-connect-a-gamepad

The problem is that the mod is just not compatible with the Nintendo Switch Pro Controller. If you try to connect the controller to something not made by Nintendo, Example: PS3. You will notice that the left joystick have issues. The controller just doesnt work the same way than most controllers do.

it means the stick is off-center when you connect it, it happens