Certain songs in a created playlist won't play on mobile devices

[LuvYaWork]

Having a problem I hope someone can help with.

I created a playlist (and also follow several others).  I can play the entire playlist no problem on my MacBook Pro, but on my iPhone can only play about half and on iPad, only 4!

This is despite the playlist showing 60 songs in the header, however when you go into the playlist on each of the respective devices, only the playable songs show up.

This doesn't happen for any other playlist that I follow, only the one that I created, so I've got no idea what's going on.

I'm a premium subscriber, I've deleted and reainstalled the app on both devices without any change and I'm tearing my hair out!

Please help, Thanks!

[LuvYaWork]

An update to this; the songs I can't play on devices are ones where the artist and/or album are greyed out (not clickable).  Screenshot of selection of the desktop attached. Only 2 of the selection of 12 show up on devices other than laptop...

[LuvYaWork]

...And on my SONOS, this is what it looks like...