Gunnery totally strange

[Shrike_UK]

i've watched quite a few youtube vids, it appears all ive seem have this issue but no-one complains, but then most are using arcade settings.
some have speculated it might be an auto aiming 'feature' as the plane is flying straight and level but the guns shoot off to the sides like they are try to shoot lead (lead as in intercept path)
hope it can be switched off.