I'm hesitant to call it a bug, but it sounds like one, at least. I drop 200,000 colonists on a new colony, but then realize there is a tiny bit of insufficient infrastructure for them (by a factor of 10), so I order to load back 180,000 and... nothing happens, even after 10 days. I move back and forth to another moon, save and restart the game, redo the order, but still nothing happens. My colony ships definitely have transport shuttles.
Any explanation other than a bug?