If you are using a child theme and you have modified section files in the child theme, then you also need to make the modifications I mentioned earlier in front-page.php
For example, if I create a child theme and want to customize big_title.php and add some extra content there. First, I would create a file in /zerif-child/sections/big_title.php, then I would make my customizations.
Even though I removed/added content, nothing will be shown because in front-page.php it uses the original big_title.php from the parent theme, so next you want to add front-page.php to your child theme and then make the replacements I mentioned in my previous post.