Editing a level after saving it and then continuing from that save is asking for problems like these... You could as well rename the save for another level and continue it in yours.

but i'm not sure why it's happening

~~dav?~~

I'm guessing, by removing a crewmate, he got the number of remaining crewmates to be -1 (which would also show up as Lots), because 2 crewmates collected out of 1 means there's 1 - 2 = -1 crewmate remaining.