If you have added Divi modules on your blog page and they are not reflecting on the front end, make sure your blog page is set as a post page in Settings > Reading area of your WordPress Dashboard.

If a page is set as post page in Settings > Reading section in WordPress, it will behave as a default post index page and divi builder content will not be visible.

To change this adjust the Posts Page setting as seen in the screenshot below.
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Note: You will need to add a blog module on your blog page in order to show blog posts on it.