Lumin software question

I have a Lumin U2 mini streamer which use Qobuz to listen to their music catalogue.  I then use my i pad to access the music.  My playlists have always been in alphabetical order by the first name of the artist.  One day my playlists went out of alphabetical order.  Whenever I attempted to add a new artist. Let's assume Rachmaninoff, this new playlist would automatically go to the beginning of my playlists, despite the First Letter was R.  Any help providing step by step directions would be appreciated to bring it back to alphabetical sorting..