Where are you leaving to?
The gun you jump into is trying to point to the relative location that the gun you just left was pointing at.
It's not like you are looking right from the nose gun and you jump to the tail and it's pointing left.
Work around: Go through the pilot's position on the way to where you are going.
Example: 5-nose gun to 1-pilot to 2-tail gun instead of 5-nose gun to 2-tail gun.
It happenes in tanks sometimes too.
wrongway