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Scrollify scroll issue on mobile view

Hi all,
I’m building a page with scrollify jquery plugin and background color change animation. It works perfectly on published desktop view. But on the published mobile view, there’s a weird transition between the sections and background color change whenever I scroll. I tried to trouble shooting but could’t find the solution. Thank you all.

Here is my site Read-Only:

Here is the published link:
(how to share your site Read-Only link)