Strange Heresy

[Aetini]

I was playing an Archbishop, created a new Rite and kept the divergence below 40.

Then I get a event notification about "Heretical Divergence" and somehow (tied to this event or something else), one of my core Tenets changes to Peace of God and several doctrines all change on their own. I don't think I can stop it except for not having made the rite in the first place; which is silly.

Anyone know how this happened?

Edit for anyone who ever gets the same weird question:
I think it was tied to Fervor. Catholic fervor hit <35 and this leads to heresy outbreaks, which I think was locked into targeting a rite - which was always (for some reason) going to be mine.