Raiders attack going weird?

There was a raiding with at least two different groups, nothing new but I noticed some of the raiders in one group were hurt while still being far away from my towers
There were two wolves following the raiders, attacking them, and managed to kill some of them. Again, nothing new
The raiding finished, and after a little while, I got a victory message about a raiders camp being defeated. I thought it was a bug but then I saw movement in the raiders camp nearby. The two wolves were attacking the remaining tower, there used to be two, and there were no raiders on sight
The tower was destroyed, and the wolves left the area. When my villagers were to pick the loot, were attacked by some raiders which I presume, were part of the defeated camp, and returned after the wolves were gone. My four horsemen made quick job of them
I know Farthest Frontier is a survival game but from time to time, weird or unexpected stuff like this happens, and I have to say, I love it

Once the actual camp is destroyed the inhabitants vanish from the screen, leaving any towers behind.