Music app shuffle switches from playlist to library

I’ve had an odd issue with Apple’s Music App.

Has anyone noticed that, say you want to hit shuffle on your favorite playlist, so, you pick the list, hit shuffle and all I’d good for the first three or so songs. Then, once it plays a song which is both on your favorite playlist AND in your general library of songs, your favorite playlist isn’t playing, but instead the shuffle feature is now going through your general library.

I’m certain it’s something I’m doing 😊 Anyone?