I hope you are well today and thank you for your question.
Please try clearing and temporarily deactivating the cache that you are using on your website.
Also, this can be due to plugin conflict on your site so please try temporarily 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.
As per your suggestion, I have deactivated all my plugins and it turns out that the problem was caused by Slider Revolution. However, the plugin is essential for my website.