One of the third-party plugins that you use causes js error on the single product https://prnt.sc/1skk0y0
Once I disabled all the third-party plugins I see that there is no error. So, disable third-party plugins one by one to find out which one causes the issue and then contact plugin author to fix the problem.
Also, why do you use 2-page builders on your site? It slows down the site a lot because page builder plugins are heavy. Why don’t you use Elementor for the product editing if you use it for the page building as I can see?
