The vampire mods I have are Vampire Realism and Vampire Hider. Vampire Hider is to talk to people when wearing a helmet, so they won't recognize you're a vampire.

So when I wear a helmet I get the normal sun damage, but when I'm without a helmet there's no sun damage effect, even though all other vampire features are still in: I still got weakness to fire, the face of a vampire and increased attributes and skills.

I used these 2 mods before in another install of morrowind and I still got the sun damage without a helmet... Any ideas?