When displaying regalia on the necramech, the chosen regalia is duplicated (twice) into the upper arm on the opposite side.
It is most easily visible using the Bruntspar Necramech Skin - however, it is not a problem of the skin. This occurs with the default skin too, although to see it you have to use non-planar regalia like the Ki'Teer Sekhara in order to be able to observe the 3D-effect clipping through the default upper arm materials.
Using the Bruntspar skin, it is easily demonstrable as follows (please view in maximum resolution):
Left shoulder has my clan symbol (red), whi