Fix incorrect shipping on Woocommerce sites

I recently hired a company to switch my two ecommerce sites to Woocommerce ones and the shipping is yet to be correct. On the [login to view URL] site shipping is too high - more than doubling when anyone enters more than one case of a Sustainable Produce Container size so I'm probably losing sales. (I do have other items on this site but the produce containers are the most important product). On the [login to view URL] site shipping is close enough (couple bucks over is fine) for the first case but doesn't double until 3 cases are added so it is too low and I'm losing money. Example to Zephyrgills, FL 33542 [login to view URL] If I enter just a single 2 Quart (37 pounds) in the cart it’s $32.47 shipping (actual shipping cost is $22.88). If I put TWO of the 2 Quarts in the cart it MORE than doubles not to $64.94 but to $79.75 (the actual cost is $45.97). Worse when triple. [login to view URL] If I enter just one 2 Quart the shipping is $24.48 (great!) but if I enter 2 cases it doesn't change and finally at 3 it changes to $45.96 (should be at least $68.66 actual cost) This math doesn't make sense and I'd like to get both sites fixed once and for all.