DIFFERENCE IN PRICE FOR UBER EATS CUSTOMERS

Last night I ordered Romans pizza from Uber Eats (Romans Faerie Glen). I really get that you pay for convenience, because it saves me a trip to drive all the way to the shop, so I have no issue paying a little bit more for the pizza. So I ordered a seafood pizza and 'n Margherita pizza, so according to their website a medium Seafood pizza (because I have to pay for the most expensive one) is R 119.90, the price I was charged was R143.90 for 2 medium pizzas. And according to their menu the price for 2 x Large seafood pizzas are R139.80. Can someone please explain to me how this works?