I have a female Argonian character infected with vampirism, she went on to become a vampire. When I finally received the notification that my character has fully developed into a vampire, her stance had changed to that of a male character's. When she runs/walks the animations are associated with male characters (broad stance, arms more outward to the sides). I re-loaded a save to about a minute before the imminent vampire transformation and paid close attention to my character's stance and walking animations. As soon as the notification came again and she transformed into a vampire, her arms suddenly moved more outward into a male stance and assumed male walking animations.

It would seem her stance returns to that of a female character's when she is not wearing armor or clothing , but as soon as armor or clothing is equipped her stance and animations turn to that of a male's. If I were to guess what is causing this, I'd say that Female Vampire Argonians were never given a specific case in regards to animations and were set to default male animations. Not exactly a game-breaking bug but it does irritate me to see my character walk around like a macho Nord.