I was adventuring around Skyrim as a Werewolf, and in Winterhold near Saarthal, I saw 2 people coming at me, but when I looked at the armor of one of them, It was Vilkas. So I was like, wtf man! we broz.
yeah, it's a bothersome "bug" on the werewolf, it seems that if you are seen by anyone that is not an underling, they see you as an enemy. Aela did that to me once, I transformed to werewolf after we beat the silverhand boss (I'm not gonna say who) and she wasn't grouped with me, and she attacked me at sight. The companions, or at least the circle, should not attack you as a werewolf, but well...they do unless they are grouped with you.