In my experience, it means some developers failed to game the system that particular time.
But you can be sure there were many other problematic moments in previous sprints, but the developer could hack together an ugly mess of a code to avoid the shame of failing in front of everyone in a meeting, and dragging the team's points down.
Because the unwritten thing about points is that they are used to shame people. In public. Sometimes not explicitly, but the feeling is there. It's always there.
