I am not sure if this is a bug, but it definitely can't be WAD!
876 start. A while back, the French Karling propped up an Antipope. This was very near the beginning. He continues to be an Antipope. Then I notice this below. The bastard-daughter of the previous legitimate pope in Rome is now a Queen-Bishop! An Antipope in the court of the current Pope, in Rome! How did this happen? I suppose I have to console-kill her, haven't I? Sigh...
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EDIT:
I am using HIP without SWMH and the ARKO packs. I haven't patched to the latest release as I am afraid it might mess with my savegames