I hope you are well today and thank you for your question.
I can see some javascript errors are occurring in the browser console on your shared site which is causing this issue.
This can be due to plugin conflict on your site so please try temporary deactivating all plugins except Unyson plugin and WpBakery page builder plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.
Removing Async Javascript plugin fixed the problem, however when I reactivated the W3 Total Cache plugin, the homepage broke again. Can you recommend another caching plugin that will not have a conflict? Thanks.