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I finally figured out why gmapping overrides the map! It wasn´t a problem of the odometry. I mounted the lidar wrong on the robot. I didn´t care about the lidar coordinate system. So I figured out in rviz when i rotate my robot to the left, the lidar-data rotate to the right. And this messed everything up. After I mounted the Lidar right -the spinning motor has to face to the back side of the robot- everything works fine.