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Published Website has Problems on Safari Version 14.0.3 (14610.4.3.1.7)

I have some Problems with my puplished site, on firefox everything is working fine, but on Safari hiding the default cursor is not working and if i click on a link on my site to a another page, and then go back to my site, all background videos are frozen.

Has this something to do with my safari version 14.0.3 (14610.4.3.1.7), or with safari in generell and what can i do to fix this?

And sry for my bad english

https://preview.webflow.com/preview/christian-bohmisch-portfolio?utm_medium=preview_link&utm_source=designer&utm_content=christian-bohmisch-portfolio&preview=cd1d5c2f7eee0807458e2a8a83e61d59&mode=preview