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Video full screen issue

Hi guys, so I seem to be having an issue with video linked to a CMS collection automatically jumping to full screen when you preview or publish the website.
I click on the link to go to that page and the video on that page takes over the whole site by automatically jumping to full screen.

Any help would be greatly appreciated.

Many thanks.

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