FIXED!!!
If I completely delete the dining room ROOM then it works!! The lights are independent and I can ask Google to set the dining room light to xx percent and it works. I can ask to turn off the dining room light and it only turns the dining room light off, not the lamp too.
It’s too bad rooms doesn’t operate 100% correctly. It should never turn off a lamp or light that is not in that room.
I will probably have to delete all the Rooms if I want these devices to dim properly and work independently, but the Google home device in some of the rooms. Guess I can create bogus rooms and move them there. Room 1, Room 2, and so on.