Min height being ignored on mobile?

My min height seems to be getting ignored on mobile. In the editor things look fine but when I preview or look at it in a browser, there is a huge amount of space below the first image.

It’s the "Hero Flex " class. When set to auto, it looks correct in the editor, but in the preview window it seems to be applying a previous 1300px min height. At least that’s what it looks like.

Here’s a read only link.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)