I don’t know if this will help, because I don’t know too much about this, but I’ve noticed when I test the game I’m working on, there are certain key combinations that just don’t work. For example, If I have a character running while aiming a gun and shooting, you would hold down up, A, and press S to shoot (that’s the way I set it up on mine anyway) but I noticed if you are holding down up, A, and S, and then you press left he won’t turn. Also, if your holding down up, left, A and press S he won’t shoot. For some reason that combination of keys doesn’t work. So maybe that’s the problem your having. Like I said I don’t know TOO much about this, but it’s just a thought that might be helpful.