I have a strange problem with my (own) robot model in Gazebo. The model and launch files are based on the ones in the tutorials.
After starting Gazeb with the robot in an empty world everything is ok. If I just exchange the world to the turtlebot playground the robot and start Gazebo again the model moves and rotates without sending any commands.
I use Kinetic at Ubuntu 16.4 with Gazebo 9.