Lumakey errors causing render fails and artefacts

I'd like to know how to fix this so I don't have to redo my polygon animating. Maybe that's the source of the problem? I'm a bit of a newbie, but this method works for other scenes in my video, but for some reason something about this lumakey clip looks very strange only in the render and then when the clip comes up later DaVinci fails to render the video and stops. It's a simple Lumakey that I've polygon'd out so I can keep the window behind my actor some space stuff without affecting my actor because I didn't use a green screen.

"example 1" is the intended effect.