We've added an upcharge (surcharge) to sizes larger than 2X , but the surcharge that is added when customer selects size is lower than the amount we specify. For example, the 2XL surcharge is $2, but the customer is only being charged $1.60. For 3XL, surcharge is $3 but customer charge is $2.40. For 4XL, surcharge is $4 but customer charge is $3.20. For 5XL, surcharge is $5 but customer charge is $4.00. How can we make the surcharge match what the customer is paying?
Ultra Cotton Long Sleeve T-Shirt - G2400WHSCC05. This is just one of them. In the base product page, the upcharge is set at $2/2XL, $3/3XL, ETC. Also on the store product page. But when adding to cart only $1.60, $2.40, etc being added. THANKS!