Default blog pages keep displaying

My website keeps displaying the default blog pages instead of my custom pages when I move around the site (Divi theme). I can tell when this happens as the default pages have a blue banner at the top. It seems to happen on the first visit to a page. When I clear the cache, refresh the browser page or leave and then return to the page it converts to the custom version. I’ve cleared the main cache multiple times (using W3), checked that my home page is set to static and not latest posts, and tried changing the Template within the Page Attributes. Any ideas why this keeps happening?

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