In the top still, the actor in the top right of the frame, in the blue shirt, his key, which I did with the rotobrush tool, got dark for no reason. The culprit was that I used the default “auto” setting in AE which had me rotobrushing at a lower resolution. WHen I would go to output, it would start to flash around, the colors would drop out, and it would look really bad.
But I fixed it!
Thanks for everyone’s help!