Welcome to the difference between net and gross revenue.
Reading this might be a good start.
Just because you don't have 3.6$ in your hand doesn't mean itch.io didn't pay you 3.6$. You must reach at least 5$ before you can initiate a payout. What you have at the moment is a future liability for itch.io to pay you 3.60$ when the total reaches at least 5$ and you request a payout.
Also the default itch.io cut is 10%, lying will not help you. All lying about the default itch.io cut will accomplish is deplete your remaining goodwill.