I have several imported playlists that have a lot more songs in the Sonos queue compared to the playlist. For example, I have a playlist (Rock Unrated) that has 558 songs. When I start the imported playlist in Sonos, the queue says it has 48,546 songs. Another playlist has 321 songs, but when played on Sonos the queue has 56,496 songs.
I created the auto playlist in Musicbee. The playlist is then exported to a M3U file that Sonos imports.
This only happens when I start the playlist with my iPhone Sonos app. If I start the imported playlist with the Windows Sonos software, it has the correct number of songs.