The adjustment should not move once it's properly set but travel trailers OFTEN have frames that are not completely rigid and in these cases if you adjust the stab jacks differently you may get a different result which shows itself in how the door fits. Most commonly if stab jacks are jacked too high (removing too much weight from the frame, the door may hang up and not close properly. It's very important that stabilizer jacks NEVER be used to level the trailer in any way or damage MAY occur to the frame.
Good luck / Skip