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I had the same problem. Two things to watch ou are 1. the namespace (note the ns=...), and 2. remapping the topic (note the <remap ....).

<!-- load the controllers -->
        <node 
            name="ros_controller_manager" 
            pkg="controller_manager" 
            type="spawner" 
            ns="$(arg robot_name)$(arg model)"
            respawn="false"
            output="screen" 
            args="$(arg controllers_to_start)"
        >
            <remap 
               from='robot_description'
               to="/$(arg robot_name)$(arg model)/description"
            />
        </node>