Hey there! Maybe what is happening is that the songs are not available. There's an option to show/hide unplayable songs and if they are shown, they're greyed out. The greyed out tracks just mean that for whatever reason, they are unavailable in your country. This could be due to licensing or the request of the record label or artist. Unfortunately, this is something that Spotify doesn't have control over as it is up to the individual music companies.
Is there something missing that you were expecting to see? Go ahead and submit a request here to find out about missing content.