mobile page can scroll RIGHT

so we added some slide in transitions on blocks, and on mobile, if i don’t scroll the page all the way to the bottom FIRST, the page can scroll RIGHT, looks like about the page width, perhaps a staging area for content scrolling in from the right?

can’t see how to fix except disabling the slide ins. we’d do that just on mobile if we could, but don’t see a way.

The page I need help with: [log in to see the link]