After receiving a pair of complaints, I realized that all of my videos have footage of myself downsampled to 15FPS, making them incredibly choppy. As one fellow youtuber said:
“oh yeah dude it’s fucking awful lmao. I’ll be straight up with you 🤣 Delete and reupload bro“
After a lot of troubleshooting, I still don’t know what the problem was, but It doesn’t seem to happen anymore after updating my editor. What a shame.