Videos not showing up on mobile or tablet

Hello,

For some reason my videos are not showing up on mobile or tablet applications. It shows a blank gray screen with the title but the video never loads.

This is the only page where my videos are actually showing up on mobile:
https://cheapandcheeky.com/gel-nails-at-home/

But the rest of the pages with videos are not working on mobile and I’m just getting the gray screen.
Here are a few more examples:
https://cheapandcheeky.com/magnifying-makeup-mirrors/
https://cheapandcheeky.com/update-ugly-oak-cabinets/

They show up fine on a desktop and with amp, just not on mobile.

I’m super bummed and not sure what to do. I’m not tech saavy at all and don’t know how to add scripts or anything.

Can you please help me out?

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