I don't know if it is just for me, but each time the red envelope say ' X Colonist has given up and is leaving the colony ' he is actually Dazed and Wandering and each time the envelope say ' X Colonist is Dazed and Wandering' he is actually leaving the colony.
Maybe you clicked on them too late/early?
Not just you. I have also experienced this.
This also happens on my game and have seen in on playthrough videos online. I didn't see this on the bug tracker.
Same here, happens to me all the time. I lost 3 colonists because I didn't remeber that when the game says that they're wandering they're actually leaving the colony.