Hi There,
Thanks for writing in! Yes, most probable a plugin conflict since your WordPress is already up to date (Version 4.50). Please update the X|Theme (4.4.2) and Cornerstone (1.2.4) to the latest version as well, including all the extensions and 3rd party plugins.
You can refer it here on what is the latest version of an extension that is bundle with the X|Theme.
I see that your Visual Composer is out of date.
Hope it helps, Cheers!