Have you paired them, as a separate room, and then grouped them with your Beam? Or, have you bonded them as surrounds? In Sonos terminology bonding, pairing and grouping have specific meanings. 
If you stream a music source such as Amazon or Spotify, do all (Beam and both Ones) play music?

If you remove the ones as surrounds, then re-bond them but with left and right switched around, which plays now?

If none of those helps, it may be time to generate a diagnostics report and contact Sonos support.

Thanks for response....I never originally had them paired, used them as separates in different rooms.

However when I set them up to pair with Beam they were paired firstly as a stereo pair, then I unpaired them as Beam set up asks to set up surrounds .

Completely unpaired and then set them individually a d renamed them.

Went back into Beam and then paired them via app, however they were still named differently but paired as surrounds as to Beam, if that makes sense.

So it's probably a factory reset of them and try again.

Problem though will likely be same as they will have to named upon pairing over WiFi. 

At a loss

If that doesn’t solve the issue (before the factory reset that will wipe diagnostic data) send in a diagnostic and ask Sonos support to look at it.