It's a flaw in the prop, really. I can't for the life of me understand why any brokerage (be it Daz or this place) will accept props and scenes that does this. It's so easy to fix in the making of the thing, and it's so ANNOYING when you've spend hours waiting for a render to finish just to see that the sofa or the floor or whatever has ballooned out of place.

But yea, unchecking Smooth Polygons on the offending thing will fix it. In Poser 5 (and 6?) you had to do it on the whole scene, thereby getting poorer results from the humans in the scene (which DO benefit from the smoothing), at least in the newer versions you can do it on each separate thing.

If it's a prop/scene you use often, you could fix it permanently by changing the line(s) in the .pp2 or .cr2 from

smoothPolys 1 to  smoothPolys 0 

(Easily done with a Search and Replace in wordpad or similar) 
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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.