Generated timeslots don’t show

Hello

I downloaded Caledarista Basic couple of days ago to add a booking feature to my website. I followed the tutorials closely, yet the timeslots are never generated. I get a confirmation message that tells me that they were successfully generated, but nothing shows up.
In the timsolts tab, and after choosing the availability, I choose auto generate. Then I input the following:
Weekday: All week days
Start interval: 12:00
Time length: 3:00
End time: 18:00
Cost: 30
Seats: one seat per slot

Yet no timeslots appear after I click create and the page refreshes.