hey @jwk
Ok I could take a closer look now.
Only the first row that is browserheight gets a special height that is browserheight minus browserbars.
All following browserheight rows dont have that special height.
Cause when you scroll down the browserbars disappear and then these rows would not fill out the browser.
In your layout, your first row is a special row that you use custom css with. It seems that this row is position absolute and this way it is not part of the so called "document flow" and this way your second row is actually your first row.
If I just change their order like this:
Screenshot 2021-01-21 at 17.23.34.png
This way the first row is the browser height row and this way it gets the correct height.