Thanks to both of you- DParker and Renegade600. These are good suggestions. I changed the group name to 'Living Room First' and, lo and behold, it now works as hoped! Yes, I should have realized using numbers could pose problems-- as, after all, there is a warning in Alexa itself on this.
I will reevaluate my naming conventions, although the 'Living Room....' does point to the room where the lights are.
Again, thanks.