So in my house in Riften I put the Volsung mask on one of the mannequins. I came back, took the mask, and left. When I came back again to my house, I found another Volsung mask on my mannequin. I took it, so I had 2 of the same dragon priest mask. I came back again like 4 days later and yet another Volsung mask was on it. So now I have 3 Volsung masks altogether and I'm currently getting confused. Has anyone had this happen? If so, does this alter anything in the future?