Hello,
There are errors in the console http://prntscr.com/ski7dn
Make sure that all the plugin that you use are up to date. Update them if necessary.
Do you use any cache or modification plugins? Try to disable third-party plugins that do not come bundled with our theme and check if it fixes the problem. If not then provide us with WP Dashboard and FTP access to your site to take a closer look.
Regards