Hello, Robert Abele,
Have you tried to disable the cache plugin and CDn and check how it works then?
Please do this test and let us know the result.
Also, provide temporary wp-admin and FTP access, so we can take a closer look.
To provide wp-admin access, you can create a new user account with administrator role via the Dashboard, and provide us with the username and password via the Private Content area.
To provide FTP access, please contact your hosting provider for assistance.
Kind Regards,
8theme team