Strange reflection effect

[Zobator]

So I have this mod which adds a visually updated version of the Daedric Face of God to the Daedric Lord Armor. It all looks perfectly normal in vanilla Morrowind, but there's a strange visual bug in OpenMW.
The mod is available here: http://www.nexusmods.com/morrowind/mods/45037/?
Anyone knows what might cause this and how to fix it?

Some screens ingame OpenMW

http://imgur.com/a/U34qX

[scrawl]

Same as #3257, I guess?

[Zobator]

Same as #3257, I guess?

But strangely enough, the rest of the armor that originates from this mod: http://www.nexusmods.com/morrowind/mods/44081/?
does not have the weird gloss bug. So there is a difference between my model and the others, but by the nine divines, I can't find what's different

[scrawl]

Actually, looking at it again, this looks like specular lighting. Can you check if there is an NiSpecularProperty in your model?

[Zobator]

Actually, looking at it again, this looks like specular lighting. Can you check if there is an NiSpecularProperty in your model?

There is indeed. But as far as I know it's a complete duplicate from the ones on the rest of the armor. I have no clue what I should change. I already tried everything I could come up with. Not that I'm an expert on models and textures though :p

[scrawl]

Probably because that other mesh has a black specular color (in the NiMaterialProperty), making the specular effect effectively invisible.

Just delete the NiSpecularProperty and then the effect should be gone.