Iʻve looked through every single block in the code and canʻt find the text. I thought it was in the checkout, but it doesnʻt show up when I look at the admin page.
Then I was thinking maybe it was in the order page settings, but the order page this customer has looks completely different from the one in the admin settings. So I placed an order myself and it does come up in the order confirmation page.
But it looks completely different from the one in my admin settings.
Looks like the standard Checkout Blocks app imbedded block on the Thank You Page. I have added a block to match yours, put the border box setting, and it looks identical. Could be something similar.
Note: that note is an app block on your Thank you page, added through the Checkout editor, not the online store theme. It is added by an app Shopify Checkout Blocks"
If so, the note may have been added through the Checkout Editor or checkout customization. If not, please let me know which theme you’re using and where exactly the note appears on the order page. I’ll help you locate and remove it.