The issue would rather be that he somehow ended up as a count-level nomad. Those are not supposed to exist, so they can cause various issues. You don't happen to have a save game from just before that happens? So that we may try and reproduce that.
Does he have the Adventurer trait? If so, then he was definitely an adventurer previously.
Does he have the Adventurer trait? If so, then he was definitely an adventurer previously.