I am making a turret. All Cores are facing forwards. All other weapons are fine. I can make missiles fire forward, up, down, right. But missiles to the left also fire to the right. They end up colliding with the turret and not coming out at all, detonating before they even travel a few feet. I verified this because I have empty space around the Missile Tubes so I can watch them fire. They fire to the right when the computer is oriented to the left.
When the Turret is undocked it fires to the left. Docking makes it fire to the right.