I made a new family in CAS and left them in the Sim Bin when I shut my game down for the night. When I loaded the neighbourhood back up this morning the Sim Bin is empty. I checked SimPE and it shows they've been moved to the Default family, even though they show up as their own family in the Family Information section. Could someone tell me how this happened and what I can do to avoid it in the future? I've never seen this before and quite frankly it's rather frustrating.

Pictures attached in case my description is terrible.