Hi Alan,
Your Divi search results page configuration was incorrect. Even if the plugin was disabled, the results page was showing always the same posts. I enabled this feature on the Divi editor: https://i.imgur.com/GAYKiq2.png
I think that is the option for the widget to act as the archive page, but you may need to check the Divi documentation to make sure, I am not that familiar with it. It looks okay now though.
