Hello,
What I mean is that please test the checkout page using a default WordPress theme, such as Twenty Twenty-Six, or the WooCommerce Storefront theme. This will help us determine whether the issue is related to our theme or not.
Based on the current behavior, I believe the issue may not be caused by our theme and could instead be related to WooCommerce settings, a third-party plugin, or a custom code/customization on the website.
Testing the checkout page with a default theme will help us isolate the cause and confirm whether the issue is theme-related.
Best Regards.