Here is cross domain isuse. The url you are accessing the site is http where as the ajax load is trying to use from https. So due to the mismatch here, its is not allowing to load. So please force your all site url to be https and it should fix the issue.
Or you can enable the Cross domain resource sharing. You can keep this in your htaccess file and it should enable it.
Header set Access-Control-Allow-Origin: *