Problem with video post format: videos are visible on computer but not mobile

Good morning dear helpers,
I am building this website and I have a problem.
I am using video post format for some of the posts on my website, but the uploaded videos are not visible on mobile devices.

They are visible clearly on computers, but they completely disappear on mobile. I tried to inspect the web page, and I think the problem is actually not about the video frame dimensions.

The page I link on this support request is the main page where all the articles are shown. The problem is with the articles with video.
How could I solve this problem? I’m really thankful for all your help in advance,
Filippo.

• This topic was modified 6 years, 3 months ago by momentino99.

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