As we do not have access to the website to check ourselves first hand we can only give general suggestions regarding this:
- Make sure that you use the latest version of the theme and the Cornerstone, if not kindly update them
- Purge all caches if you have a cache plugin
- Check for possible 3rd party plugin conflict by deactivating all plugins except Cornerstone. If the problem is fixed then kindly activate them one by one to find the plugin responsible for the problem.
- Is the problem only happening on one page or all pages? If only it is on one page that seems to be a corrupt one so try to recreate the page
Finally, I suggest that you check our troubleshooting guide here:
To be able to assist you more on this you will need to move your WordPress website to a live server so that we can access the WordPress Dashboard and check the case.
Thank you for your understanding.