Please update the theme and all the related plugins to the theme. https://xtemos.com/docs/basel/update-theme/
Also, update the Woocommerce database in the Woocommerce > State > Tools.
The reason is either incorrect Woocomerce templates or links configuration.
Please make the full backup of your site, delete all the Woocommerce pages, then create them again in Woocommerce > State > Tools. If it does not help, contact your host support on links configuration.