Official comment
Those are dynamically generated playlists. To have those updated, open iTunes, then refresh them, close iTunes (wait a few minutes), then update them within rekordbox. If you're using the sync manager to update it, use that first, then update your USB drive.
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Hello all, I have a question? Can someone tell me what the round arrows in this snapshot are? And all playlist are not syncing to usb and I was thinking is that the reason (the round arrows) in the iTunes list... And how to remedy the problem.. Thanks for any help!