So I put ahzidals armor set on a manequin left the house, came back the manequin was floating so I took it off, came back and now I have another pair, I will see if I can doup deathbrand as well. Lets hope I'll edit my find into this post
BTW has this happened to anyone else?

This is a common bug that's been present since before Dragonborn.

Really, all of them have been patched and someone earlier posted its back b/c dragonborn

Oh, well since it's back, you can sell the extras or give them to followers.

I guess I will try to give to my follower.

10 azhidal armor sets and btw it looks awful on a guy he looks "FRUITY"

It looks better on the female NPCs.

yup doesn't matter what armor it is all armor Dupe's on those mannequins..not a bad thing if i must say

Yea i built a new house for more duping quins and took miraaks stuff from solstheim and I went back but only his gloves and boots are duping

hmm maybe it is just on solsthiem..cause i have this same issue as well but like i said i dont mind it.

No b/c azhidal dupes are in hjaalmarch house

Question:

The Morokei and Nahkriin masks aren't in my possession anymore (either I forgot to pick them up or I accidentally sold them). Therefore I wasn't able to finish the quest with collecting all dragon priest masks.

But, would it be possible if I might duplicate two of the masks I already possess and place them instead of the two missing masks? Did anyone try out if it works then?