Empty iTunes playlists

Most, but not all, of my playlists are empty as I try to access them from my work computer, which is synced via iTunes Match. Playlists that contain tracks have an iCloud icon next to them with a download icon in the center of the cloud. The empty playlists (which are about 75% of my collection) have the cloud icon without the download icon in the middle.

Any suggestions on how to get the songs back in my playlists?