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Problems with background video in a tab element.

Hi friends, I have a tab element on my website, inside tab I have a background video. I don’t know why the video doesn’t shows up, whenever I change the tab the video appears for a moment and again it disappears. I have 3 such tabs on a single page 2 out of which is problematic and 1 works perfectly fine ! I don’t know what am I doing wrong, can someone please help me out.
Here is the read only link of the website -
Look for “Home page V2” page