Hi George-
The reason this is happening is actually easier to see on the desktop, where if you look closely you’ll notice that your homepage has two scroll bars, one in the page content and the other for the site as a whole:
This is likely due to some mis-matched HTML elements, but it’s very easy to fix. Edit your page, switch from the Text editor over to the Visual Editor, and the editor will automatically fix any mis-matched elements. Update your page to save the fixed results.