I have no idea what's causing it.

I've been trying to render this video for the last 10–40 hours. I've switched between software and hardware encoding, restarted the application multiple times, cleared the cache, and tried every possible fix I could think of. But every time I render, there's still a random 1–2 frame glitch somewhere in the video. This isn't the first time I've run into this issue either. I'm honestly so frustrated at this pointI have no idea what's causing it.