Screen Tearing Glitch on Export / Not Visible in TImeline - Desperate for Help

Hey guys

I filmed a project with multiple green screens. Essentially it's a gameshow, with three contestants who each have a green screen under them as if it's a TV monitor. Each monitor has their significant other appearing to answer questions. We filmed three angles:

- 1 wide on the three contestants

- 1 medium on the host

- 1 close on the three contestands. It's a float camera that gives us a close-up of a contestant and their significant other in-monitor, then pans to the next pair, and so forth.

Because of the complexity of this, some green screen elements, and some moving cameras, I edited each angle separately. I put together all the green screen elements for each angle in a sequence, then exported each angle as its own final video. We always use the 1080 Youtube setting, VBR 2 pass, and Maximum Render.

 

When I take the final angles into Premiere, it's no issue. Everything works well. I do a normal multicam edit.

However, when I export, there are little glitches the entire time. They look like screen tears. I have no idea what's caused them. I constantly do video projects and they have only shown up in this gameshow project.

 

Anyway, my deadline for this video is essentially last night (Sunday night). The edit was done on Friday day, and when I exported it and saw these glitches, I started doing everything I could to try to fix them but nothing has worked all weekend. It's tough because the video is 75 minutes long, and the glitches change where they are every time, so it's very hard to check. Video drivers are up to date, Premiere is up to date, using a custom built PC - 32 GB RAM, GeForce GTX 1660, no issues with space on the hard drive.

Really hoping someone can help me! Thanks!