Hello,
1) Do you have problem with the price update on the single product page or on the cart page? If you have problem after add to cart then go to Theme Options > WooCommerce > Single product > Single product layout > AJAX Add To Cart For Simple Products > Off and check again.
2) In case you have problem with the price update on the single product page then maybe plugin author uses some WooCommerce hooks that are missing in our theme. Could you, please, contact plugin author and ask what hooks do they use for the price update?
Reply back to this topic with the plugin author answer and also provide Dashabord and FTP access to your site to check and add the necessary hook if it’s missing.
Regards