move_base behaviours strange on pioneer

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Hi,

i have a pioneer 3dx and wanna navigate it with move_base. But it is totally strange. If i send a goal, the robot calculates the right path, but then he drives in the other direction. The cmd_vel commands which get published are negative

here is a video of the visualization.

Any ideas how to fix this? And where should i start debugging, do you think it is a problem with move_base or with the setup with the Robot?

If i send cmd_vels with positiv values the robot drives straight ahead.

regards,

peter