Thanks for writing in! I checked you site and I see you're using an outdated version of X and Cornerstone. Please update X and Cornerstone to the latest versions first and see of this resolves your issue. 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If you find anything to be out of date, you can review our update guide.
Let us know how this goes!