Strange parallax scroll

The link for the page is a public post preview so it may disappear in 24-48 hours. If possible, review it before or let me know I will add a new link.

I am trying this plugin on my site but the parallax scroll is jerky and wants to go back as the page scrolls. I have another one on a staging site with the same settings and it works, here is the link to that:

https://www.testbed.biz/test/

I will greatly appreciate your help in making the AWB plugin work on my live site.

Thank you,

Cemal

The page I need help with: [log in to see the link]