So I've just finished the Kindred Judgment quest. Now whenever I transform into a Vampire Lord in Castle Volkahir, the first person to see me transform is always immediately hostile and constantly attacks, while the others simply go about their business as though nothing is happening... Why is this happening? It's quite infuriating to say the least.

Hm. Sounds like a glitch. I suppose an easy fix would be not going Vampire Lord in the castle.

It's really odd... whoever sees you first remains hostile while the others just watch said person wail on you without intervening or even acknowledging what's happening.

lol I don't think it's even a glitch, it happens to me too. probably just something they left out