Because the script remember your race at the time you have bite by lord harkon so if you change your race after that bite, you will meet that glitch. You should load your save and change race before the bite. yeah i figured that, but the thing is, i changed my race before i got a vampire, but then i played a werewolf, and i didnt notice the change (dark elf to high elf) before after i was a vampire... and for some reason i decided to delete some old saves to get more space ._.