How to stop Apple Music shuffling between playlists

Hi,

I've got an iPhone 13 Pro running iOS 17.3.1. I have several playlists that I've compiled in Apple Music on my Mac. I plug the phone into the computer to copy the playlists over to my iPhone and until yesterday, everything seemed to be working perfectly. I"ve attached screenshots to illustrate what I'm talking about.

Today, I noticed that on of the playlists, when Shuffle is selected is shuffling songs from other playlists, instead of simply shuffling the order of the songs on the playlist.

The screenshot Playlists.png shows how I've got the playlists set up. Screenshot Fast and Hard shows how shuffle has been working thus far.

Fast and Hard

Music for your ears

Start the playlist, tap shuffle, the songs are played in a random order.

Screenshot Music for your Ears shows that when this playlist is playing and shuffle is selected it's shuffling from the playlist Fast and Hard

Can anyone tell me how to remedy this? All I want is for a playlists to play songs in random order from the songs on the playlist I've selected, not to shuffle songs from other playlists.

Would deleting and reinstalling Apple Music help? Is there some setting that I've tapped inadvertently? Have I set this up all wrong? I've been using Apple Music this way for years with out a problem.

Thanks!