The playlist feature does not seem to play in chronological order like the list suggests. Often, videos will be completely skipped despite being next in queue. There doesn’t appear to be a logic to the decision for which video to play next.
Could it be that you have enabled the “shuffle” button on top of the playlist?
Yes, that seems to be what happened. I assumed the green was the button’s normal color rather than the shuffle-is-active color and never bothered to click on it to check.
Alright, I’m glad this could be resolved!