Hey, thanks a lot for the feedback! I work at KAYAK so I'll make sure this gets to the right people. I don't work on mobile but usually it gets QA'd on a plethora of devices but maybe they didn't hit your corner case somehow. If you'd like to give a bit more information such as specific device names or other stuff, you can reply here or just post feedback at:
http://www.kayak.com/feedback/form
All feedback always gets read and routed and engineers quite often reply to feedback from their area.