Twentyseveteen Child Theme - Mobile Menu JavaScript doesn't trigger on every page

I built a Child Theme using Twentyseventeen as a template. I used the CSS from theme and worked on the Custom CSS for the website for a while.

I've noticed today that the strong textmobile menu expands only on the homepage.strong text When I try other pages, mobile menu doesn't trigger the JQuery event, so it doesn't show the menu at all. If anyone could help me out with the code.

Here is the link to the production website:

Thanks a lot!