Funny you remember doing that too lol. I already had to cut its range in half (from 180 to 90, apparently the number isn't its total range, but the distance it can go from center). It's prolly cause I only did the Orion..
At any rate, it really shouldn't be doing that. Sometimes when you are turning fast and the turret was pointed at the side, it almost looks like it was firing forward. IE if the turret is firing to your left and you are turning left you can often see its shots..
I was afraid this thread was about the galaxy's top turret firing through a couple of the engines lol. Don't expect a fix for that.. Doable, but would require restricting the range more than I'd like.