Starred playlists differ between devices

[gwafle]

I'm new to Spotify, and i've just added it to my Sonos system. I've begun the process of syncing my starred tracks to play offline, which is working fine on my PC.

However, I go to my Sonos menu, and under the header of "Starred", only a handful of tracks show up (consequently, the tracks that do show are ones I added a few days ago), and on my phone, no tracks are listed under "starred" none of the tracks are local, btw.

Also, i'm getting a message on my PC client saying "could not synchronise playlists. Retrying..."

Many thanks..