Hi Robert, I don't see the problem BUT .... if you want to scroll down the page your mouse pointer has to be on the page, not on the Tableau embedded part.  If your mouse is on the Tableau part, Tableau is taking the mouse actions thinking you are scrolling on the graph (which you can't do on the bar graph, but you can do on the map).

Hmm .... I loaded the page again and now I can't scroll at all .. very strange

I don't think issue by Tableau. You can copy and paste Share Code in Tableau Public without change the code web.
In my opinion, it might error code Web animation.

Take a look at the developer console in Chrome, you've got a bunch of javascript errors which have nothing to do with Tableau.

My guess is it's something to do with the javascript which 'zooms' in on the header when you are at the top of the page.