“Ajax add to cart” don’t work

Hello, I use the premium extension.
For several days, the “Ajax add to cart” feature has not been working, when I click on my woocoommerce button to add to cart it reloads the page and the product is not added to the cart.

I’m using the Divi theme, and no extensions have been installed for this to stop working.

Do you have any idea how to solve this problem?

Thanks in advance!