This page is a part of the WooCommerce plugin and our theme doesn’t influence it. So if it doesn’t work as expected then some of the plugins or extra code breaks it.
Firstly, we need to understand where is the problem coming from. That is why we asked you to disable all external plugins one by one. You can check is it our theme issue or not by switching to the default WordPress theme.
All our theme scripts are located in the file js/functions.js. You need to disable JS minification in Theme Settings -> Performance to debug this file.