How to free up slots in appointment slot

Hello! Even if I already deleted an appointment, the form says that all slots are filled. How do I fix this to show the now-vacated timeslots? 

Here is my form: https://form.jotform.com/201528685981062 

There should be slots open left since I deleted some appointments

To clarify, did you delete the submission data associated with the appointment slot?

You would have to delete the submission data to release the slot.

I would suggest to download your submissions first before deleting them as we cannot recover deleted submission data.

Guide:https://www.jotform.com/help/73-How-to-Download-Form-Submissions-as-Excel-CSV-PDF

Please give it a try and let us know.