Hector SLAM gives very odd maps

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Hello,

I am trying to map the environment using Hector_SLam. All I did was make the turtlebot move straight and just turn to the right. I recorded this on the ROSBAG and played it again to get the map. But, the map is so out of place. I tried adjusting the clock with

rosparam set use_sim_time true

and ran the rosbag as

rosbag play xxxx.bag --clock

But I have not been able to get any good results.