I created a few playlists. I listened to them for a couple of days. The next time I opened up my MP3 files on the computer, I realized that the only songs on any of the particular albums were the ones that I had put on a playlist. It had removed the remaining songs from the album that were not added to a playlist.
I deleted the playlists, deleted the effected albums and started over. I currently do not have any playlists.
I have a Sansa Fuze