[app_monthly_schedule] shortcode issue

Hello,

I'm having a problem with the [app_monthly_schedule] shortcode on my page. This has been added via the do_shortcode function in the page template and is displayed correctly on the page. The correct days and timeslots are colour and I can click the days.

However, nothing happens when I click on a day. The time slots do not appear for me to proceed with the booking.

Can you help me solve this issue?

Many thanks,
Steven