Appointment reminder flow: get reminder message when replied with response; why?

I am following the tutorial at https://www.twilio.com/docs/studio/tutorials/how-to-send-appointment-reminders , and used the template . When I trigger flow using rest API, I get the SMS in the destination (To) phone . Then when I respond on the phone with 1 , I get reminder SMS again . can't figure it out why -- must be simple . Link to flow https://www.twilio.com/console/studio/flows/FW98a09b72c0507c95324d5b6f138e4fbf

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