Are you using any of the girl packs? There are multiple duplicates, typically between the EE packs and the Megapack. Combine the .girlsx files with the editor and delete whichever duplicates you prefer least. If you have multiple copies of a girl with different names, where the description reads:
<Name>
<Type>
<Generic description>
and the type and description are the same, then they are random girls.
If they are not random, and not duplicated in the .girlsx files, then you may have a bug. In that case, post a save file and I'll take a look at it.