I noticed it when I could not change the frameid of octomap. When I launched it it displayed: /octomapserver/frameid: odomcombined . This was strange because I had changed the frameid to odom in the launch file. But nothing changed. So I took the launch file to an other directoy but still it launches. Then I removed octomap from my workspace and compiled it new but one can still launch it. I am really confused. I am launching: roslaunch octomapserver octomap_mapping.launch