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If the obstacle was not present when the global planner calculated the global path, then it would explain what you are seeing. The global planner will not look for a new global path until the local planner tells it (via the move_base node) that it has "given up" because it could not follow it. The circular path that you are seeing for the local planner suggests that it is doing some strange oscillation, so you may want to adjust your settings to make sure it can give up and let the global planner re-plan.