Order Confirmation Processing Block .. vs duplicate orders

[DrByte]

I figured it out.

I'm using the responsive_classic template.

On mobile, this template switches to using includes/templates/responsive_classic/templates/tpl_ajax_checkout_confirmation_default.php

That file didn't include the processing text, etc.

Slight clarification. It's not a mobile-specific issue.

When using a payment module that collects credit card numbers directly on your site, the store will use ajax to load the checkout-confirmation screen, instead of transmitting card data to/from your server. To do that it will load the tpl_ajax_checkout_confirmation_default.php instead of the usual tpl_checkout_confirmation_default.php.

So, yes, if you manually customize one of those files you should apply the same customizations to both equally.