Cannot Set Appts With Plugin

I have the plugin installed and styled but it is not functioning properly and I have no idea why.

The plugin can be found here:

https://hammerdev.oru.edu/make-an-appointment/

It is loading properly and allows me to scroll through the months to select from but I cannot change the date of selection or select any of the times to make an appointment. Any help here would be amazing.

https://www.ads-software.com/plugins/appointments/