Duplicate Playlists

Hello fredmarkette,

Just to clarify, are the playlists themselves being duplicated, or content within the playlist? That information will help us get a better understanding of the issue.

Please check out this link to ensure the correct process is being used to sync content between your Mac and iPhone, so we can make sure there aren't any issues there: Sync content between your Mac and iPhone, iPad, or iPod touch over Wi-Fi

Sync content between your Mac and iPhone, iPad, or iPod touch over Wi-Fi

You can sync your Mac and device when they’re connected over same Wi-Fi network. To set up Wi-Fi syncing, first connect your device to your Mac using a USB or USB-C cable. You then turn on Wi-Fi syncing and choose the settings you want. Whenever your device connects to your Mac over Wi-Fi, you can select it in the sidebar and sync it. (You can turn on automatic syncing if you want.) Your device must have iOS 5 or later or iPadOS 13 or later.

See Intro to syncing your Mac and your devices.

If you're using Music on your Mac and want to find and delete duplicate items, please check out this link, which outlines that process and may help: Find duplicate items in Music on Mac

You can find every instance of a song by the same artist anywhere in your music library. For example, the same song could appear on the artist’s album and on a movie soundtrack.

You can also search for exact duplicates, in which a song, artist, album, and version are all the same (if, for example, you inadvertently imported a song twice).

Thanks!