Paying to much using fare calculator versus fare increase guide

I am currently traveling from Lagoon beacj to Civic centre the fees for mover peak is R33.00 and on the saver it is R28.50, however the distance on map on gps is +-10km it shold be R11.50 and R10.50 i am paying the fee basically for the distance of 50 - 60km. this is all based on your website. why am i paying so much.