Hi There,
Thank you for the credentials, but I’m sorry we can not do an update to your X because your WordPress is outdated (this seems to be the culprit of the your issue).
Better you update everything and start with WordPress to avoid incompatibility issues.
First, update your Wordpress. Updating WordPress
Then, update your X and Cornerstone. Updating Your Themes and Plugins
Then, update all your extensions and plugins, especially your slider plugin. How to Properly Update Plugins
Remember to clear all caches (plugin, server-side, CDN, and browser’s cache) after updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Let us know how it goes,
Cheers!