Mobile page layout shows different content

I made updates to a page on my site, converting everything to the new Fluid engine. Everything looks/works on desktop view, but the mobile view removes content and changes styling.

This is a page containing DJ mixes and links. On the desktop version (which is accurate) you can see the first DJ mix. When you switch to mobile view (or view on a phone) the first mix disappears and the layout goes wonky when scrolling down.

Why is the content and layout not the same? Why is the first piece of content disappearing?

You can edit page > Click Mobile icon on top right > Then you can adjust layout on mobile > This won't affect desktop

(Remember to duplicate the page, just for backup)