Faces behaving weirdly in Anrold render

[Ibelinn]

So I've never encountered this problem before and I'm struggling to find a solution.

I've just finished texturing a character and imported the textures into Maya so I could render them in Arnold.
When I render the character mesh with a general material, it looks fine and how it's supposed to be;

But when I add the material from substance, this happens. It seems like the whole arm mest just shrunk down in size? And this doesn't show in normal viewport, just when i render it out;

I thought it might be reversed faces at first so I tested that out, but that makes the mesh bloat way more than it's supposed to;

I'm at a loss as to what's wrong, and I can't seem to google the right terms to come to any solution. Any help would be greatly appreciated!

[damaggio · Accepted solution]

You have a displacement map. You should read how and when to use them.

[Ibelinn]

And there you can see how I'm not so well versed with 3D yet. Thank you!!! I haven't setup many materials in Maya, only in UE so this was new problem for me.