Hello,

I have checked the site, I switched to the parent theme and the product page looks as it should.

Most likely, your customization in the child theme causes the problem. Please copy all the code of functions.php into a separate file and save it, then clear this file in the theme, and add snippet by snippet into functions.php checking your site to detect which one causes the problem.

You would better delete the themes you do not use, leave one default theme for testing, and keep it updated.

Best Regards