I've seen objects jumping around. In my experience, it was related to the height the object was being spawned at. One object, either taller or shorter, was replacing another.
What I did to fix it, was to go find an instance of the new object I'm wanting to spawn (often in another map) and look at the X/Z/Y of where it spawns, and go stand there myself to determine the altitude of the ground it rests on. Then, with just some real simple math, I determine how far above the ground I need to spawn it. Then using that offset, go stand on the carrier (in your instance) and apply the offset, then use that number in your OS.con.
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