Hi , I am trying to book a round trip United award ticket from New York to Edmonton , when I search for one way tickets it shows 12.500 miles each way , if I try to search for a round trip ticket it shows 12,500 one way and the return jumps to 25,000 , if I go back to one way searches it goes back to 12,500 each way , I would prefer a round trip ticket anyone know why this would happen ?