Not proceeding to PayPal after adding appointment to Gcal

After selecting an appointment day and time, the confirmation window shows up and prompts the client to add the appointment details and add the appointment to their Google Calendar.

I (as the test client) am then taken to my Gcal to confirm the appointment.

Once I confirm, the appointment is added, but I am not taken to any PayPal payment button. The page stays on Gcal. How can this be fixed?