The recommendation engine takes into account the choices made prior to the current meal before making a new recommendation. You are seeing the "Looks like you selected a combo" message because someone else made a selection using the hacker account and the app will not let you select multiple meals in the same time period. This will not happen if you created an account for yourself.

There is a FAQ link in the app that addresses some of the issue you brought up and we are working on incorporating the rest. As of now the only way to go back to the home page is to hit the log out button.