The headline seems to be working fine on my end and don’t see any issues. However, I see that you are using old version of X Theme which is incompatible with the version of Cornerstone you have on the website. Please see screenshot.
I suggest you to update X Theme and Cornerstone both to avoid any compatibility issues. To update Cornerstone and X Theme please take a look at following resources:
Version compatibility guide: To learn about the latest and compatible versions of bundled and supported plugins, please take a look at following doc:
2. Theme Update guide: Please take a look at following article to update Cornerstone.
3. Please take a look at following doc about changelog: