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I'm not sure this is desirable behavior, but the way that DWA works is that it assumes that you can rotate in either direction at a given max speed. Thus, it will explore trajectories from [-max_vel_theta, max_vel_theta]. For you, 1.0 falls in the range [-11, 11].

Okay, so what does min_vel_theta do? It makes sure your robot is moving in some direction.

However, the above command should fail the check given, so I'm unclear what the problem is.