hi,everybody knows why i set a DHL rate with 0.5kg is 11usd,and 1kg is 15usd,but when i add a products to cart and weight is 0.4kg,the system is count it 15usd,i already set the Package Tare Small to Medium and large - added percentage:weight to 0:0 .but it just can't count the weight correct?do anybody helps me?i use 1.3.9H,thanks advance!