Welcome to the community
@MashStari. There is a known bug in the engine which we fixed in 4.0 where controlers could conflict in multiplayer, but it doesn't explain your issue here. I'm our lead developer for OpenBOR, but I didn't have anything to do with this game or use controllers.
@Kratus helps me out with controller code in the engine and
@pudu is the game creator. I am tagging both of them to see if they can offer some insight.
DC