I checked on my own test site, and when using the Kadence theme the star icons are missing on the product reviews UI, where there seems to be some clash between the font styles from Toolset and Kadence, we'll need to dig deeper to see exactly what the problem is there.
But I don't see obvious problems with the rest of the styles—my submit button looks like a normal button, for example.
I think to look into those issues we'd need to be able to take a closer look at your site to be able to compare the intended and actual results (I can only see the actual results at the front-end link).
Do you have a staging site we can work on to do some basic testing?
Let me mark your next reply as private so that we can get log-in credentials from you—you may want to create a temporary admin user for us to use that you can later delete. And be sure to have a current backup of your site.
I can login into your website, and tried these:
1) Switch to WordPress default theme 2022
2) Test the single product post in frontend, it works fine, I can see the stars correctly
So it is a compatibility issue with Kadence theme.
It seems Kadence theme replaces Woocommerce CSS/font style with their own CSS/font style, for example:
Blow link is the star font file, which loads when you switch to theme 2022 hidden link
After switch to Kadence theme, test single product post again, it was replaced with their own font file hidden link
It conducts the problem, can you check it with Kadence theme support, check if it is possible to dequeue their Woocommerce CSS/font files?
