VHBloodlines does not add any new races and I have checked the entries in TES4Edit for one of the NPCs that has this problem - she was defined as a Nord.
So what I am trying to discover, is where does OB get the eye meshes when an NPC has contracted vampirism?
I have looked in the OB Meshes.bsa, but can't seem to find it or figure out how the default "Nord" eyes are changed to the Vampire ones.
Any clues on how to find this out so I can resolve the problem will be very much appreciated.