Strange Noise/artifacts with delta keyer

Hi there, I'm a student using Resolve 16 and I'm having some trouble with the delta keyer. The issue i'm having is a little hard to describe so here is an image.



No matter what settings I change the horizontal bars where the greenscreen is not keyed out still appear. Twiddling settings does change things, but the unkeyed background still appears this way. I also tried using a clean plate to no avail. I also rendered out the clip to make sure it wasn't just Resolve's monitor window giving me trouble. Also, as you hopefully can see, the foreground objects do not have this weird effect on them which hopefully narrows things down to the delta keyer node itself.

If anyone has suggestions or any ideas of what is going on I'd be glad to hear them.
Many Thanks!

[Peter Chamberlain]

This looks like a GPU overload but without system or GPU driver info it’s a guess.
Try the 3D keyed in the color page.

From time to time I seem to run into weird behaviour in Fusion that's solved by shutting Resolve right down and then starting it back up again. It's worth a shot to see if this is a "real" problem or just some sort of glitch.