I’ve just recently got myself a full set of Nightmare medium armor, and I notice that there’s something off about the Nightmare Helm.
http://imgur.com/a/yD7Od
As you can see from those screenshots, the mask/monocle thingie kinda floats about an inch in front of my character’s right eye.
I’m not sure if this bug only affects the Sylvaris, but the mask seems to stick perfectly on the human character’s face > http://i.imgur.com/tMxQa.png