Root node transformations are not discarded correctly in some cases
Those vampire heads are disconnected from the bodies and aren't rendered correctly. The Breton male vampire head is from Westly's Heads mod:
The vampire can be found in Ashmelech.
And the female Argonia and Kahjiit vampires from Solfs Beasts mod:
They both can be found in Serano Ancestral Tomb.
These heads do render correctly in the vanilla game, will update if there's more vampire heads that have these issues, tested in March 25, 2020 (Windows nightly).