This is an addendum to a post i made in 2024.
When i played MKF i encountered a problem pertaining to my controller not working. The problem was, that it read keyboard inputs from my controller.
I've found the answer, and it's Steam's fault; or more specifically its Desktop Layouts in the Controller tab of the Steam Settings. Steam did not recognize any game being played, so it defaulted to using the Desktop Layouts of the controller; turning it off fixed the issue i had.
I'm posting a solution here, incase someone comes asking about the same problem.