When searching for a pet to hatch with in the kiosk, it would improve the user experience if KI would change the way it handles a person who must purchase an elixer in order to hatch.
Currently this action resets the kiosk and forces you to find the pet you intended to hatch for.
I can see no reason why that behavior is preferred or necessary. It should leave the kiosk interface where it was when you click buy elixer.