Observe the repeat pattern before replacing the list
If one video starts again while later playlist items are never reached, inspect the repeat state before assuming the list is corrupt. Note whether the player repeats only the current item or reaches the last item and returns to the first. Those are different configured outcomes.
Read the control’s current scope
YouTube’s mobile guide says the playlist Loop control repeats the list, while selecting it again shows a numeral one for repeating the individual video. On television and console players, the Repeat control can explicitly display Currently playing or Playlist. The visible state is therefore more useful than remembering that you previously enabled “loop” somewhere in the interface.
Choose an appropriate practice sequence
For example, someone following three short setup demonstrations may want the complete playlist repeated. Check that the control targets Playlist rather than Currently playing or the single-item state. Someone practising one instruction may intentionally choose the opposite. Test with a short familiar item and observe the next transition, rather than leaving a long playlist running merely to infer its setting.
Keep repeat separate from saving or access
A loop preference does not save a temporary queue, download the videos or guarantee that every playlist item remains available. If the desired next item cannot be opened independently, investigate that item’s actual status. If it plays but the repeat state keeps returning to the first item, record the device and visible loop label for support. Avoid deleting the whole playlist to diagnose a single selected playback mode.
Questions, answered
What does the numeral one mean in mobile playlist looping?
YouTube says it selects repeating the individual video rather than the complete playlist.