I don’t know why you have that problem. I have checked your website and you have enabled the image static background, don’t you?
If you want, you can create a new user to me in your admin panel. It is faster if I can change the code for testing. I have done this with other users and there were no problems. You can trust me. I only want fix this problem.
My client has decided on using a static image for the time being, and if we do go back to a video, it will probably be self-hosted to avoid YouTube ads.