WooCommerce customers cannot logout because the logout link in the header menu does not correctly generate a nonce.
Very easy to recreate the issue on the site in 2 steps:
1. Create a new WooCommerce customer account.
2. Mouse over the the account icon in the header and click on log out. You will be redirected to the account page and will not be logged out (because invalid nonce).
The menu was created via your theme builder and the logout endpoint was added from the list of the available options. the nonce it creates is different when I log out and back in, then remove and re-add the item to the menu. But then this number ends up being static for all users.