Please enter a note for the gift card.

In the gift card settings “Disable Notes Field”, I have checked “Disable notes field when purchasing a gift card”. But when I try to use the gift card, after I add it to the cart, I get this message that won’t let me complete the purchase: “Please enter a note for the gift card”.
How can I get rid of that message?

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