I am having the same issue as js42uk when I am testing out the booking function.
The following link is a screenshot show on my BUP.
https://bit.ly/1roJNX3
All 3 fields were submitted with information, but only the address field show up in my BUP appointment page. The difference between the “address field” and the other two were that the “address field” were pre-filled with information through custom meta field and the other two fields were typed in with text right before submitting for the appointment.
I hope this helps clarify the problem. Please help.