Hi John,
Thanks for reaching out.
It might be an issue with the cache, I would suggest you please copy your live site to a staging server and update the Pro there and clear all type cache including the Style Cache from Cornerstone > Settings > System > Clear Style Cache and check in the incognito/private mode of the browser.
If that does not resolve your issue, there might be some different reasons behind your issue. I would like to suggest troubleshooting the following common issue to help us to recognize the reason.
1.Theme Related Issue
2.Plugin Conflict
3.Theme Update related issue
4.Child Theme Related issue ** if you have activated it.
5.CSS/JS Customization
6.Disabling Cache
If none of the above helps, please provide login credentials for your staging site in a secure note to examine it further, including:
– WordPress Site URL & Login URL
– WordPress Admin username/password
To create a secure note, click the key icon underneath any of your posts.
Thanks