Thank you for the login information. It seems that you are using another 3rd party plugin and the mixture of our plugin and the 3rd party plugin is causing the issue. You either need to use our plugin or the 3rd party plugin.
If you decide to use our plugin, please purge autoptimize and WPFC cache and deactivate them for few days.
Then go for example to the UK page which you gave the screenshot which has the problem of not having the Author and adds the author name in the snippet box in the page edit screen:
That should do the trick.