I'm experiencing this and I don't think this is a duplicate of the one you linked, it appears that if you are producing space science on the platform that is moving between Nauvis and other planets, if you have some space science staged in an Orbital drop slot that hasn't dropped yet, and your schedule starts to take you to another planet, the space science stays in the orbital drop slots and gets dropped off at the next planet.
What causes the items to get put into the orbital drop slot, but not actually sent down? If on your platform you have a manual logistic request for 0 min 0 max Space science Importing from Nauvis, and on Navis a request for set 10,000 space science you can get this issue. If your landing pad logistics has 10,005 Space science in it, the 0min 0 max platform puts the science into the orbital drop slot, but the satisfied planet logistics causes the orbital drop not to launch, then when it gets to the next planet, it immediately launches the orbital drop to the planet regardless of if that planet is requesting space science or not.