I am using percentages for coupon codes, and they are not giving the full amount when there is a minimum order amount. If there is no minimum, it calculates the discount amount just fine.
Example: Minimum order=$100.00, first item price=$2.25, order total=$112.50, discount=25%, discount amount=$0.56. It is way too low, should be $28.13, not 56 cents!!!
It seems that the discount is only being calculated on the first item put into the cart...