Date Field & Month Selection

I have hidden fields, so follow these steps to get to the CF7 Datepicker on my site:

1) Go Here: https://mylesandann.com/advanced-rsvp/
2) Select ATTENDING
3) Under “My invitation mentioned that I could bring,” select any option, “MY AWESOME SELF“, “A DATE“, “MY SPOUSE“, “MY FAMILY“
4) The date fields for the plug-in are under “We’ll be arriving in Aspen on… and leaving on…”

Expected Behavior:
Clicking in a date field brings up the calendar. Clicking the dropdown box or the arrow on the calendar allows the user to select the month. Clicking a day populates the date box and hides the calendar.

Actual Behavior:
Clicking in a date field brings up the calendar. Clicking the dropdown box or the arrow on the calendar does nothing. Clicking a day does not populate the date box and hides the calendar.

Thanks for your help.

https://www.ads-software.com/plugins/contact-form-7-datepicker/