Hello,
would you please uninstall the multi-step checkout plugin and re-install the 2.5 version from here?
Let me know if the issue is solved in the 2.5 version, so I can also make an official release on the ww.wp.xz.cn repository.
I uninstalled 2.4 and installed at 2.5. The problem is still there.
Would you add the following PHP snippet to your child theme’s functions.php file:
remove_action( 'woocommerce_checkout_order_review', 'woocommerce_checkout_payment', 20 );
If you don’t feel comfortable editing the child theme’s functions.php file, then you can use a plugin similar to Code Snippets to add the PHP snippet.
Let me know if this solves the issue with the double payment section.