Can't add more than 2 robots to map

[alexcn3]

I am trying to visualize a swarm with stdr and using my launch file, I've added three robots but only two appear whenever I run the simulator. The two that appear are inconsistent so it does not seem to be a problem with notation. I'm not sure if this is a bug or a fault of my own. My launch file is described below:

<include file="$(find stdr_robot)/launch/robot_manager.launch"/>
 
<node type="stdr_server_node"
      pkg="stdr_server"
      name="stdr_server"
      outputs="screen"
      args="$(find stdr_resources)/maps/simple_rooms.yaml"/>
      
<node pkg="tf"
      type="static_transform_publisher"
      name="world2map"
      args="0 0 0 0 0 0  world map 100"/>
      
<include file="$(find stdr_gui)/launch/stdr_gui.launch"/>

<node pkg="stdr_robot"
      type="robot_handler"
      name="$(anon robot_spawn1)"
      args="add $(find stdr_resources)/resources/robots/simple_robot.xml 1 1 0"/>
    
   <node pkg="stdr_robot"
      type="robot_handler"
      name="$(anon robot_spawn2)"
      args="add $(find stdr_resources)/resources/robots/simple_robot.xml 2 1 0"/>

   <node pkg="stdr_robot"
      type="robot_handler"
      name="$(anon robot_spawn3)"
      args="add $(find stdr_resources)/resources/robots/simple_robot.xml 3 1 0"/>