Hi again,
I checked your site registered on your account and I see you’re using an outdated version of X and Cornerstone that could be the cause of the issue you’re having. First update your X theme and Cornerstone to the latest versions. You can find the latest version numbers here: (http://theme.co/changelog/) Then you can compare them to what’s installed on your site.
If you find anything to be out of date, you can review our update guide.
I would recommend that you create a staging site for updating. This is very useful because you can test drive any X or Pro updates in the staging area, do the customization and troubleshooting without disrupting your live site. Once everything is perfect, you can easily and flawlessly proceed the update in the live site. To know how to create a staging area, please check out these articles:
http://www.wpbeginner.com/wp-tutorials/how-to-create-staging-environment-for-a-wordpress-site/, https://maintainn.com/2015/02/how-to-create-a-staging-site-for-wordpress/
After doing the updates, always remember to clear all caches (if you are using WP Rocket, WP SuperCache or W3 Total Cache) when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
I also tried to find the page you’re referring to but couldn’t find the page. Can you please share the URL of the page in question so we can see what’s causing the gap issue but I’d highly suggest you to use Cornerstone to build your pages so that all is in your control. It’s easier and faster to create pages in Cornerstone. To get started please see https://theme.co/apex/forum/t/cornerstone-content-builder-introduction/118
Thanks!