Oh, look, a use for the incognito function available on most web browsers that won't make you feel guilty or ashamed of anything. Apparently, airline websites use your browser history and cookies in order to evaluate how badly you want to go to a certain destination while also comparing their prices to the prices you've already encountered and raising them, making sure that they aren't "underselling" their own flights.
That's where the incognito function comes in: this will help get all those pesky airlines off your back so that you can view their neutral, unadjusted prices for all their flights.