Maybe working as intended, but I had two Miasmic Repulsors overlapping another faction's land. She complained and I agreed to stop. One orbital disappeared (as I expected), but the other remained in place. A few turns later when it dropped, I got the message from the faction that I was lyin' scum for not keeping my promise. Perhaps all orbitals should be removed rather than just the first offender as I would expect that the mechanic would work like "remove your units from our territory" makes all units leave. I don't have a save game.