Hi Peter,
I compared the theme css as well as the responsive-menu1.css. It’s the same on bothe servers.
Could it be, it has anything to do with the warning in viewport?
Viewport Meta Tag Check
Warning: get_meta_tags() [function.get-meta-tags]: URL file-access is disabled in the server configuration in …/wp-content/plugins/responsive-menu/classes/class.responsiveMenu.php on line 2021
Warning: get_meta_tags(https://www.hendrikrojas.com) [function.get-meta-tags]: failed to open stream: no suitable wrapper could be found in …/wp-content/plugins/responsive-menu/classes/class.responsiveMenu.php on line 2021
Viewport Meta Tag Not Found