Preloader not working on homepage

Hi, I have had issues with HTML displaying on my page before it is fully loaded. I contacted Divi who suggested I use a preloader. For some reason, the preloader works on all pages except the homepage, so the issue of the HTML displaying is still happening. How can I stop this and get the preloader to show instead? I have tried adjusting the settings but nothing has worked. Thank you for any help.

The page I need help with: [log in to see the link]