Unable to see songs in Collaborative Playlist/Not Updating songs in Collab Playlist

[casin0r0yale7]

So recently I made a new collaborative playlist so my friends in my band could add songs that we want to do play in the band, and for a little while it worked fine. However, after a while it stopped updating so I thought one of the guys had simply stopped adding songs, but to my confusion he says that he added a load more songs than that and showed me a screenshot of his phone to prove it (see below).

I tried everything, I tried refreshing, using different devices, going offline then online but nothing worked - all I could see were 5 songs, 4 of which were added by someone else, the other was just me. My friend does have Premium and I dont but I cant imagine that making a difference, so does anyone have any solutions to this problem? If you do please lemme know and i will be v. greatful. 

What I can see:

What my friend can see: