We are facing a mobile-only WooCommerce cart/mini-cart issue on our website

Hello, Plethora,

Thank you for the detailed investigation and technical information.

Based on the behavior and the debugging data you provided, the issue does not currently look like a failed WooCommerce add-to-cart request itself, because the AJAX request returns status 200 together with valid cart_hash and fragments.

The main issue appears to be related to WooCommerce cart fragments not being initialized or refreshed correctly in the affected mobile context.

A very important indicator is:
wc_cart_fragments_params is undefined

Normally, WooCommerce uses the wc-cart-fragments script to keep the mini-cart/header cart synchronized with the real WooCommerce session cart through AJAX fragment refresh requests (get_refreshed_fragments).

At the moment, it seems that on mobile devices the XStore mobile mini-cart/header cart can temporarily display stale fragment data instead of synchronizing with the real WooCommerce cart session.

This would explain situations where:
– the product appears in the mobile header mini-cart,
– but disappears after refresh/opening the real cart,
– or the cart quantity in the mobile header remains outdated after removing items.

Since desktop works correctly, the issue is likely related to:
– mobile-specific script loading,
– cart fragment initialization,
– JS optimization/delay/defer,
– or caching interaction affecting WooCommerce fragments on mobile.

To properly investigate this further, we need direct access to the environment to:
– inspect script loading order,
– verify whether wc-cart-fragments is being dequeued or delayed,
– test WooCommerce fragment refresh requests,
– check mobile-specific XStore header/cart behavior,
– and inspect possible optimization or cache conflicts directly.

Please provide:
– WordPress admin access
– FTP/SFTP access

This will allow us to perform deeper debugging and identify exactly why the WooCommerce cart fragments are not synchronizing correctly in the mobile cart/header context.

Best Regards,
8Theme’s Team