MS Bookings: Follow up email sent to clients even though we have not set up Follow-ups

MS Bookings: Follow up email sent to clients even though we have not set up Follow-ups.

Clients receive a follow up email 15 mins after their appointment, with the 2-hour reminder text, so it's confusing to them. We have not set up follow up emails, so this is a bug. How can we get this fixed?