page builder content different from visual/text editor

I have been using Page Builder for the first time. Works great overall.

The issue I have found tho’ was when Yoast started reporting a problem I knew was not there. Yoast reported a minor ‘readability’ issue, so I changed to usual editor, visual/text and clicked the corresponding Yoast eye to view where exactly it thought was the issue in the page and I found that the content in visual/text is different (completely different) to the content in Page Builder. It was still showing dummy/demo content and none of the content we had added. Yoast, it appears is recording data from visual/text and not page builder. However, in a newly created page, yoast does report page builder content. Why would old dummy/demo data still be in visual/text when clearly it’s been replaced via page builder?

Any thoughts?