WooCommerce Headings Placeholder Footer

Hello, When designing In Mailpoet within WordPress for Woocomerece Emails, There are a couple things that can’t be edited (because its in the code). That’s totally fine, the issue is one of the items that has to be there says “Thanks for your purchase”. This item says that it can’t be altered because it is linked within Woocomerece, but me + my customers are seeing code on the footer not the “Thanks for your purchase”. The code is [mailpoet_woocommerece_heading_placeholder], if you could please help out that would be great, its confusing and doesn’t look good.

The page I need help with: [log in to see the link]