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Video element doesn't show correctly in my website

I worked with video element to integrate several demo video into my website.

After I publish my website, all the videos don’t show up unless you click on the video area in the screen.
When I look at the video area, I can reload to show the video, but once I scroll up and down, the video thumbnail disappears again.
Here is the link to my website,

It’s my portfolio website and I think it’s important that the video shows itself well when a reviewer first open my project.

Does anyone else have this issue before?


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

I just found that my issue only exists within Chrome browser, thanks!