I see what you mean. Sometimes I see it in your video.
But I found it strange that it’s only sometimes and always on the same moments, so I went on and watched the video frame-by-frame on those moments when I see it and I noticed your video has frame-skips, for example at 1:07 and 1:21. There are probably more but I did not check further. A frame-skip makes the combing effect visible.
Do you constantly see the combing when looking up/down? Or is it sometimes? Make sure you’re not having frame-skips during emulation, or you’ll definitely see the combing even when it shouldn’t be there.