I just check your site previously and i see currently you’re using JNews Speed and WP Super Cache plugin in there. If yes, please try to enable Load jQuery Early option. You can find this option on the Customize > JNews : Speed Option > Advanced Options > Load jQuery Early. After that please clear the cache from JNews Speed plugin and your browser cache.
If you still getting the problem, please try to deactivate both plugins just for a while and then clear your browser cache.