On the home screen edit page if you click on the title of things that you are changing, like button arrangement, left click, reset to defaults. This returns everything to the boundaries they should be at to "pass export."
Did it tell you which screen the errors are coming from, or specifically what objects are outside the boundaries? I got the same error the first time I tried, turns out it was because I wanted to reposition some banner objects to other parts of the screen but forgot to expand the banner itself to encompass the parts where I wanted to put the stuff.