Oblivion, Importing & Exporting playermodel Armor mesh .nif causes it to stretch

[PuppersLover]

So, without doing anything, I import an Oblivion armor, make some changes here and there (to be specific, all I did was fix the smoothing and mirror the left pauldron) and then I export it, but all I get is an outstretched, almost invisible mesh.

Am I doing something wrong? If so, what can I do to fix it?

If needed, here is the .blend file where I did the changes and how I export it.
armortest.zip

[PuppersLover]

So, I may have a solution:
All I did was open the new exported .nif in NifSkope, save it...And that's it. It makes the Mesh go first before the Skeleton, unlike the export itself which does the reverse for whatever reason.

And just like that, it fixes the problem. I don't get it, it makes no sense, why would NifTools reverse it?