I got Materialize html theme on envato elements and am using SEO template. The template is great, I am very happy with it except for this one bug:

Problem:
1- smoothscroll.js breaks scroll in Opera.
2- getting rid of it fixes scroll in Opera but breaks sticky header in all browsers
3- the version of Smoothscroll I have is not the latest. As soon as I update it to the latest one, scroll gets fixed in Opera but sticky header still breaks

Here are the links: Without a link to smoothscroll: http://econocard.ca/demo/no-smoothscroll.html

With template’s default smoothscroll: http://econocard.ca/demo/smoothscroll-enabled.html

With the latest smoothscroll: http://econocard.ca/demo/smoothscroll-latest.html

I am ok with no smoothscroll, it seems to be buggy and unnecessary in general, but I need to fix sticky header. Please help.