Issue with Mobile Devices view

Hallo Guys,

I am having a problem with a website that when you view the site on a mobile device, it acts all strange. I have done the optimisation for mobile devices and it all looks good when i am looking at it in the admin side and on a desktop. As soon as I view it on a mobile device, it goes weird.
- Menu suddenly doesn't work
- Page with is out showing very wide

Could you please have a look at the site:
https://t.ly/Pby2k

Kind Regards
Stephan

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