@Nick2517
Either you thought you had changed the policy but hadn't completed the process or it's a glitch.
It's been ages since I changed my cancellation policy, so I don't remember what the steps were. However, I did turn off instant book for all three of my properties. There were several steps to go through as the system is set up to really try to discourage you from doing so. I found this especially true when I got to the third listing. I had to repeatedly click, 'yes, I am sure. turn it off!!!' or whatever the wording was.
A few days later, I checked and it had been turned back on for that listing. Same thing happened when I first listed. I turned IB off and then woke up the next morning to a bunch of instant bookings and smart pricing had meanwhile slashed my prices in half.
Amenities you have selected suddenly disappear and you have to go back in to select them again. IB pre booking message suddenly disappears and you have to re-enter it.
It's frustrating, but you have to keep an eye on your settings as they sometimes mysteriously change.