So, most large ships usually have an issue docking if you aren't near the center of a lane. The Siege cruiser is much smaller than most of these ships, and it'll specifically make an effort to auto-move away from the center of lanes. I've gotten stuck several times in a row trying to take a lane, while lined up with the middle, because the LSC will veer off to the very edges of the lane. If you initiate docking from a far distance (400m+) it doesn't seem to have as much of an issue, but if you're nearly at the speed-dock range of a lane, the ship will veer off to the sides, and 2/3 times get stuck doing so. At a distance, the cruiser will still angle itself away from the center of the lane.
It will also steer off to the edge of gates which, while it doesn't seem to stop it from eventually jumping, ends up being extremely time consuming.
EDIT: Just kidding, this was me trying to dock from a distance after pointing at the lane.