Yeah, I see you got your problem fixed.
But what it's doing is saving things that are defaults that are gonna need to be defined in game. In a Volume control pages need a min/max height otherwise they'll adjust and overlap.
Scrollsize is usually the same as size unless it's a scrolling page.
In UIBuilder there's a button you click click that will show all default values (ones that only get saved if they are not default) and go through the list and find what's changing from your old version.
That is... if you haven't already figure that out
