The only purchase of this package within the last 24h has a 6$ tip included as far as I can see. I don't have a lot more information on the purchase, other than standard buyer information.
I imagine that you might have accidentally added the tip by selecting the suggested price (which is 12$), rather than the minimum price when making you purchase.
I would suggest contacting itch.io's customer service; this is not an issue I've encountered before, so I'm not sure on the procedure or if there are one for this sort of issue. In case that does not work out, you are welcome to contact me over mail (penzilladesign@gmail.com), and we'll figure out how to handle it :)
