Layout change the sketchup drawing, why?

Why does layout always change back to a older version of the drawing when I save it? How can I stop that?

You need to select a scene in the model to reference.

And no, this is not intuitive at all. But once you get used to it it works.

Probably due to the way you are creating the reference or modifying the viewport in LayOut. Hard to tell with no information. Can you share the LayOut file?