Closing on scroll doesn't occur as expected

[GMZC]

Make sure the bug can be reproduced in either demo page or a forked codepen page.

It's visible on various pages at this address, an artist website we delivered recently.

Describe the bug When the content is scrolled the zoomed image doesn't close and I can't figure out why.

To Reproduce Steps to reproduce the behavior:

1. Click on an image to zoom it.
2. Scroll.
3. Image moves offscreen but doesn't close unless you click.

Expected behavior The image should close and get back in its place to prevent clicking.

Desktop (please complete the following information):

• OS: Mac OS Yosemite
• Browser : Chrome, Safari
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.