Weapon attachments rendering off weapon and in camera 1.7

Random weapon models/attachments rendering in camera where they don't belong. see video https://youtu.be/k3uPKkSkkrU

using new character skins, no weapon skin applied.

Hasn't encountered this from POV, but seen on replays and when spectating in 3rd person view. Somehow started only with 1.7, never got any attachments issue in earlier versions.