Full-Width Block Issue

Hello,

I have a full-width cover block with a two-column block inside on a page. When I use this block with this theme, the left twelve characters are cut off and about a third of the image on the right side is cut off. It appears that the theme is displaying the content at a width larger than what the screen actually is. However, there is no scroll bar at the bottom.

I do not have this issue when I switch to the Twenty Nineteen theme, so I am left to assume that the problem is with the theme. I have also disabled all plugins, but I still have the same problem when the Challenger theme is enabled.

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