I noticed that the site template is not displayed correctly. At first I thought it was a problem with the cache, but after emptying the cache and deactivating the cache and CDN again, the problem still exists and the main problem is in displaying the thumbnail images and some of the template designs are not displayed correctly.
Please deactivate all the 3rd party plugins and activate only theme-required plugins on the site and then check the issue. I am sure your issue will be solved. Then Activate the 3rd party plugins one by one and check which plugin is creating the issue for you.
Otherwise, if the issue still exists then keep the 3rd party plugins deactivated and share the wp logins details so i will check and give you a possible solution.