If that were the case, Black, then all users of the files would have that same issue. They do not (or, at the least, haven't reported it if they have). It is therefore reasonable to assume that the files, nifs, and textures are correctly made. That being the case, the problem must be something on Kitten's end, though for the life of me I can't think of any settings that would result in that.
Personally, (and understanding this is a horrible answer) if it's only those two hairstyles, you aren't using them for your own character, and they aren't being used often (or at all) by NPCs, then I'd just ignore it. An alternative is to delete the records for those two from the ESP so they won't even be available. Really, it depends on how you want to deal with it.