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Hi,
The robots in this stage world have "stage controllers" (look for the ctrl elements in the world file) which implement the flocking behaviour, so it is not surprising that they all move. If you want to control a robot from ROS then you probably don't want that robot to also have a stage controller.
Stage controllers can be useful if you want other robots in your environment that move according to simple rules, e.g. as dynamic obstacles. I've found that there are some issues with using them in Fuerte which led me to make several edits to the stageros wrapper (and to Stage). The wander controller example in the ROS tutorial on stage controllers doesn't work under Fuerte.
Regards
Graham
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