Odd Gunnery Occurrence

[eBeaker]

Every so often, I'll have a situation where I am using my guns, where if I aim at the target and fire, the shells fly elsewhere, always hitting the same location despite how I might turn the turret between each shot. I'm using WSM 3.0 atm, but I recall the same happening on occasion when I was using a sub.

Any ideas what I might be missing here?

eB