No, I did not add anything extra during the payment process. I have just clicked "Buy Now" button to check again, and it seems that the default price is set to $12.00 without any action on my part. If I had added a tip, the total charged would have been more than $12.00.
Is there a way for me to cancel the payment for this product? I have never attempted a refund on this website before, so I do not know how to proceed with a payment cancellation. I plan to purchase these icons along with your other products, the Pastel GUI Bundle for $3 and the Romantic Icons for $2.