When flying in a ship, distance between the camera I'm in and the ships weapons output block I'm shooting from offsets the crosshair.
It's hard to notice on smaller ships, but if you try a camera 100 blocks above your weapon, you'll see it's shooting 100 blocks below the crosshair.
Also, this bugtracker is a pain to use and asks for a bunch of unnecessary info that -at least in this case- has nothing to do with the bug.