Invaders not chasing creeps
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In one of my mining rooms, I have a group of Invaders that can't quite figure out how to reach my creeps: https://screeps.com/a/#!/history/E5S11?t=10295324
They chase nearby creeps as they pass by, but then get stuck near the border of the room now and then.
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The three healers are blocking the attacker, so it's unable to find a path (and the healers are unable to follow it along that path). Once your creep came in on the other side they reshuffled and unblocked the path. Apparently invaders aren't smart enough to get out of each other's way.