I've had this "issue" as well -- in air quotes because I'm not sure how much of it is attributable to pibkac and how much of it to some bug in the ui. At any rate, if I understand correctly, you disable auto-provisioning on the device and then proceeded to make configuration changes on you Obi device's webui directly. The changes you'd make, in this case, a password, would revert to the Obitalk setting for that field. The way I "fixed" this was by going to
obitalk.com where I had made the original change to the auto-provisioning setting and then finding the same setting(ie. the password) in that interface and changing it there as well.
It feels kind of sloppy since one of the things I expected by disabling auto provisioning was that I don't have to worry about Obitalk touching my settings at all moving forward. Please let me know if this is kind of what your concern is about and/or if you need more details since I gave you the tl;dr version.