The part I was thinking about is not a bug, but something else that I didn't mention.
For example, I have this one sim I am constantly playing here and there, and she is fully skilled with all skills completed. Usually, I only play her when a new pack comes out and I'm wanting to just see what the new pack has to offer. Well, this sim has been human and vampire many many times, I'm constantly going back an forth with her. Sometimes when I save her to my library as a human and then bring her back as a human, then turning her back. It's when I do this will she have lost just a bit of her vampire abilities, and rank, not all the way, but some. Regardless she has a ton of vampire points that it is nothing to put her back to where she was before.
