I have checked your website from the backend and updated the plugins related to the woocommerce.
Also, I added the next code into Additional CSS, to fix the problem with the product description list:
Since the woocommerce plugin is not a part of the theme, In order to properly create the variable product I suggest you ask for help on their forum.
Also, I found the next guide helpful:
maybe you should try to follow it.
Thank you for your understanding.