Hello. It seems that recently on this site (http://www.longviewithaca.org/) editing or adding any new pages results in the content being duplicated on that page. My client edited the home page and the Careers page (http://www.longviewithaca.org/about/careers/) and you can see the content is doubled on both of those pages. The content is not doubled in the Pro editor.
I tested by creating a new page from scratch (http://www.longviewithaca.org/test-content/) where I added only a single text block. And you can see that text block appears twice on the front-end. The text is not repeated in the Pro editor.
This is not happening on all pages, just ones that have been recently created or edited in Pro. There is no caching, CSS/JS-minifying or anything like that installed on this site. Running Wordpress 5.6, and Pro 4.0.11. Any ideas what might be causing this?