What does it mean when a faction has more imprisoned lords (P) than total lords?


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I thought the P in the faction relations screen was the number of lords of that faction that are imprisoned, but in my game the Sarranids have 4 (7 P) there, which doesn't make any sense. Maybe some of the imprisoned lords switched to another faction while still in a dungeon, but then why would they be counted as the Sarranids' imprisoned lords?

I'm playing Dickplomacy on Warband 1.168 if it matters. I have economic changes on low and AI changes on high.

EDIT: A few days later and it's back to 7 (7 P).


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Actually it means that the faction has at least 11 lords. 4 of them are free and 7 are prisoners - and there may be other that are not accounted for.