Hi There,
You mentioned above that this site just recently converted to PRO, if you still have the Cornerstone on the Plugins panel, please deactivate and delete it. Pro has a built-in Content Builder, it does not need the Cornerstone.
I see that your site is under CloudFlare. Please exclude the Content builder from being cache by using this pattern *flightlinedrugtesting.com/x/* follow this article on how you can add a page rule (exclude) on your CloudFlare account.
Then under the Speed panel, please turn off the Java and CSS minification
Then under the Caching panel, please Purge Everything, so the cached minified JS and minified CSS on your site will be regenerated.
Purging of caching is important to make sure that the site is not loading outdated resources that cause issues.
Let us know how it goes,
Cheers!