It has come to our attention that some websites are facing challenges with demo content and premium plugin installations. We are working on a solution.
I hope you are well today and thank you for your question.
Please update the theme on your site to the below latest version as described here https://support.shufflehound.com/updating-theme/
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Also, 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.