Cornerstone not rendering updates in preview

Hi - I am in the process of editing a page in Cornerstone and only some of the elements are displayed in Cornerstone preview (see screenshots below). All WordPress and Cornerstone plugins and templates have been updated. I have refreshed and cleared cache on both browsers.
Cornerstone
Cornerstone Preview

Hi,

Please check for the following first:

  1. Ensure everything is up to date according to our version compatibility list at https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195. Just note that as of this time the latest version are Pro 2.3.8, X 6.3.8, Cornerstone 3.3.8. Please follow the best practices when updating your theme and plugins. See https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62 for more details.

  2. If you’re using a caching plugin, clear all caches including browser cache then deactivate your caching plugin and other optimization plugins.

  3. If you’re using a CDN, please clear the CDN’s cache and disable optimization services.

  4. Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.

  5. Remove custom CSS, Javascript and templates.

  6. Reset your htaccess file by renaming it to .htaccess-bak. Then in WP Admin Menu, go to Settings > Permalinks and just click the Save Changes button.

  7. Contact your host to increase your allocated memory or do it yourself by adding this code in your wp-config.php

define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );

7 Check php and mysql version. Wordpress requires

PHP version 7.2 or greater.
MySQL version 5.6

8 Make sure you have the latest verion of wordpres

Wordpress 4.9.8

Please confirm that you have done all this and if the issue persist kindly provide us your wordpress admin login in Secure Note

Thanks

Thanks.

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