Nav links and video not working on mobile

Good morning everyone,

I am almost finished with my website but when I access it on mobile my navigation does not work and my youtube video does not play. When I press play the page glitches out and it sends me back to the top. I am unsure as to what the issue is after researching.
Code :

Kind Regard -

They’re working here on Android Chrome and Firefox.

That interesting - when i pull it up on my iPhone it doesn’t work. On both chrome and Firefox…