Battlefront switching from keyboard to console controls

That's interesting; Do you have a controller plugged in? The only time I've had issues like that was when I forgot I had left my controller plugged in, and it turned out where I had put it down had one of the control sticks tilted. 

I'd double-check to ensure there's no additional peripherals attached. 

What platform are you launching BF2 through? It might be a steam setting causing the issue, as well.