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Hello.

What probably happen is that when you spawn the world, there is a physical interaction between the environment and the robot (i.e. the robot is at (0,0,0) and a wall also). This produces a very strong force that throw the robot away (usually in the sky).

Is the robot still appearing in the models' list (left) ? If yes, try spawning your objects in a way the robot and the environment are not at the same place (using -x -y -z arguments).