I found a way to fix it, but it’s a pain in the arse. Just end customizer and go to edit a random page, not your front page. Switch editor to code view, then exit this page and edit your front page in code view. Search for the trouble block and compare with others and you’ll see some div or <p> is missing or one exists with nothing in it. Fix it up and save the page, then go back to customizer and it should be fixed
