Checked the story levels. Found I do have a problem there. See the attahed .jpg. The second story has the same dimension for the bottom of the level and the height of the level. If I change the height of the second level, then the bottom of the third level goes up by the same amount. If I change the third level, the second level changes. It is like those two numbers are locked with 136 inches between them, and I can't change them.
I am surprised I have not noticed it as any kind of a problem. I went back a couple of versions and found this has been set like this for several months.
I'm sure that's the problem which has come to light via the modules, but can anyone tell me how to unlock the link between the second and third levels.