EDIT: This problem seems to be limited to a single family. Don't know if it's got anything to do with it, but it's a sim I made in CAS and exported with SimPE. If I create a sim in CAS and take him on a vacation the game behaves)
If you clone a sim in SimPE and export it back into the game, you should re-clone the newly exported Sim in Bodyshop to ensure residual crap is removed. Straight SimPE clones do not always behave well in game.