Thank for reaching Spotify Community.
My insights might not be the exact solution of your issue, but I will try up to my utmost knowledge in answering your concern.
Is the title of your songs "grayed"? if so, you might need save it your library and download it. I prefer to turn your download toggle switch on under you "Songs" in "Your Library" in that way all songs you save to your library will be auto-downloaded.
Lemme know if my insight helps you.