I've seen this happen a lot. I thought it was intended behaviour. Or at least a logical consequence of the system.
What I think happens is: The script checks for the presence of the character/ family member with the [Name of City] Defender trait. If there isn't one it spawns a new stack with such a character leading it.
However, if you play long enough, the character will die in combat or from old age. Now, there no longer is a character with the [Name of City] Defender trait, so a new stack is spawned.
But the old stack isn't gone. It just stands there, leaderless. (From what I've heard, I think there is no way by script to remove a specific stack?)
So play long enough, and there will be more and more ex-defender stacks around the barbarian settlements.
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