Hey Shaun,
There’s an error coming from http://farm-direct.co.za/wp-content/plugins/lightbox/js/frontend/custom.js. Please try testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
Please also remove customizations then check if the issue persists.
Thanks.