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it happen twice already. I played on Peasant Origin, WoTN and Beast and exploration installed. auto pause when exit town addon installed.
My total brothers is 18, day 80.

Is this related to "Orc prisoner" event? when a new brother to join you.
Since i play Peasant origin, i wanted an adventorous noble or disowned noble to join me. i repeated this contract on purpose. since there is no other way for peasant origin to get these brothers.