Dear Chico,
It’s all about the theme issue that you have used. The theme using a custom checkout page template instead of using the WooCommerce default checkout page template that conflicts with our plugin.
Moreover, We have fixed the issue for your website.
Also, we will provide an update of our plugin ASAP for others. You will get notified via email when the plugin update will avilable to download.
Best Regards,
ThemeLooks Support Team