So, I had a Duke revolt against me. After crushing the rebellion, I tried to revoke his title to the duchy, and the game will not allow me. When I hover over the "Revoke Title" button, it says that I cannot revoke a title that's a justification for an ongoing war, but there is no ongoing war. Furthering the confusion, I can press the "Revoke Title" button (it's not greyed out), but then I can't "Send" the revocation, and the reason given there is that the Crown Authority doesn't allow me to, but I have High Crown Authority in my Kingdom. I'm confused as to what's going on here. Any help?