Gmapping overwriting /tf

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I am trying to use Gmapping to work with rosstage
However, when I run gmapping:

rosrun gmapping slam_gmapping scan:=base_scan

gmapping overwrites the /tf topic. The resulting metadata and the new /tf topic from gmapping claims the robot is not moving. Thus the map and the locations are worthless. When I look at the /tf directly from stage I am getting the odometry values which look like they are pretty accurate. The problem with using odometry is when I do move to a real robot there is no way I am going to get an accurate map. However, gmapping is not giving me any results in either /map or /map_metadata. (It claims the robot is at -100 -100).

So I guess my first question is why gmapping is overwriting the /tf topic and 2) why is it not changing the location of the robot.

Originally I was trying to get move_base working but now I am just trying to get gmapping to work. I have gone through the tutorials and visualized the map sure enough it is all from one point.

Thanks in advance, ~BM