Pregnant sims shouldn't go to work, so obviously they didn't play them normally before packaging the game. I think they cheated the pregnancies and forgot to adjust the work schedule. The real problem is the career outfits. Without that issue, I think all would go okay. Many say that when they adjust the career outfit in CAS, then change them into the 2d outfit, all is well again.
Hm... I wonder what might have been left behind when you changed it to a residential lot that attracted Sims to the lot. Oh well... at least you can delete the lot and replace it.