AH tax

i noticed that in the auction house, when i want to sell items in one number stacks the tax are way more than what it say. why is this? does it just happens for me or what? thanks.

Any specifics? For items with a price, min deposit cost per stack regardless of stack size is 1s

thank you. i thought what the addon says is correct. i usually sold my item in one by one stacks. now i understand. thanks again.