After selecting a category, and then selecting a particular receipe, the receipe is displayed. The backbutton takes you back to the category screen. Could it be designed to move back to the last categorized list of receipes, that you were on before selecting the receipe you had just looked at? A user may be searching for a particular cheesecake, but not want to have to return to the top category and reselect cheesecakes, then another receipe. Just a preference....