Phantom speakers on Airplay

I use SONOS speakers with Airplay throughout my house. My music is stored on a desktop Mac and I use Apple Music linked to my music library and the Apple Music online service.

I have two Era 100 speakers stereo paired in my Work Room setting and two Era 300 speakers stereo paired in my Living Room setting.

The Era 100’s are behaving as they should and show only under one Work Room setting name on Airplay.

The Era 300’s show as two Living Room settings on Airplay. One is the stereo pair but the other is a total phantom and has no function.

I have un-paired and re-paired the Era 300’s and I have totally factory reset both Era 300 speakers, relinked and and re-paired them but still I get the phantom Living Room speakers with no function on Airplay.

I cannot remove the phantom Living Room speakers. Is this a SONOS issue or an Apple Airplay issue? Has anyone any idea how I can fix it?