Background video loading error

I have a background video on the homepage—everytime it loads, or I click on another page I get a weird section on the upper left corner of the page:

This link has a screenshot and a video showing the issue: Imgur: The magic of the Internet

Can someone help me understand what’s going on?


Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Please share a read only link to your project.

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