Mobile product details section jumps on scroll

I located the trouble-spot on mobile which causes the content to jump on scroll: the #product-content section that has two different js onscroll calls on it. One adds/removes a class of product-select-bottom and product-select-fixed. The other is a more involved sticky class another developer is working on, and which is the main culprit of the "jumping" on mobile only.

I tried a simple ghost div to prevent the jumping, but it breaks the layout in tablet/desktop.

Here's a link to my sandbox: [login to view URL]

Two images below highlight the trouble spot.

I would like help on fixing this. Thank you.

Skills: CSS, Bootstrap, jQuery, HTML

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About the Employer:
( 10 reviews ) Huntington Beach, United States

Project ID: #21338876

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Hello, Jump issue on scroll? seems easy fix to me. Provide me with detail, so that i can check. thanks.

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