Pagination Not Changing With Settings

On my page at it is showing 10 articles per page. I have changed the setting to show 20 articles per page but it isn't changing. See screenshot.

I have disabled WP-Paginate, I have dumped WP-Rocket cache and browser cache, have tried in three browsers, two of which have not been opened since I added more articles, and still it is only showing 10. Is there something else that could be preventing the pages from showing 20 articles?

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