It's an issue with seemingly all the liner ship models which to me seems to have something to do with where the "control point" around which the ship steers has been placed on the model itself. All the liners seem to have been modeled around the same control point. I'm only guessing, though the longer transports such as the 5kers don't seem to have the same problem, and they mainly pivot around their center point. From my experiences, it mainly seems to be an issue with the planets in the systems surrounding the faction cores as well as the independant worlds, and at least a few planets added by the mod itself.