There are a few reasons why tracks may not be appearing in your playlist.
The playlist is public, but the tracks are private
If your tracks are private, they cannot be seen by anyone but you unless you give them explicit permission. To share a playlist of your tracks, either make the playlist private and share the secret link [LINK TO SHARING], or make the tracks within your playlist public.
Over your upload allowance
Track was removed due to copyright infringement
Whenever a track is blocked for copyright reasons, you should receive both an email and an on site message to alert you. Follow the 'More info' link from your Tracks page if the track should not have been taken down, and you would like to dispute or learn more about the removal.
Please note: SoundCloud only accepts or reviews disputes made through our Disputes form, and not through email support.
Deleted or private tracks from other users
If you have a playlist with tracks from other users in it, it may be that the other user decided to delete, or make their track private. This will remove it from your playlist.