That's also a possible scenario. Sometimes Spotify users create more than one account for different reasons. In such a case you might have two or more accounts. If you're accidentally logged in to the wrong account, you won't be able to see the correct playlists.
We suggest you head to this help page. Make sure you check all the troubleshooting steps and especially the ones for finding other accounts.
Hope this helps. Keep us posted.
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“Music is the strongest form of magic.” Marilyn Manson