Responsive menu problem

I’ve made my site, and it works almost, as it’s supposed to.

I have one weird problem though.

The responsive menu doesn’t work, when I scale my browser window down.

It will appear, as it is supposed to, but when I click it, it’ll unfold, and then it looks like the entire page reloads. The menu just reverts to normal.

It works on my android-phone, so it’s only a problem on a scaled browser window.

https://www.newnordica.dk

Regards