Songs missing from playlist

[tartaruss]

Hi,

I opened up Spotify on my laptop some time ago, and opened my playlist. As I watched, some of my songs disappeared, and the playlist settled down at 138 tracks. It had 207 tracks before.

My phone (Android) still shows the playlist as having 207 tracks, but when I click in, it only shows the same 138 tracks as my desktop.

Why did the songs delete themselves from the playlist, and how do I get them back?