I am also having the same issue you are having when scrolling down the page. I’m using the Ocelot theme but even when I did a preview of the Royal theme it did the same thing. Any help would be greatly appreciated.
2. When you scroll down a page, the theme (usually near the bottom, but sometimes in the middle of a page) will snap to the top of the page over and over again. It will not let you scroll to the bottom of the page.