incomplete playlists on y iphone5

I have synchronised my new iPhone5 with iTunes on my mac.

As my music is supposed to be on the cloud with Imatch I can't select which songs or lists to synchronise anymore.

However when I wanted to listen to my playlists, some were incomplete and did not show all the tittles in grey with the small cloud beside like I used to have on my iphone4 before.

What should I do to get all the songs of my plaulists to show again?

Thanks

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