After launching the turtlesim_example the location of the initial turtle in the world model is [0, 0, 0] (lower left corner) but this is not correct. The actual location can be seen by running the move skill once with distance 0. The location is then [5.54, 5.54, 0] in my case. This can cause problems for example when spawning another turtle and executing the follow skill with the first turtle as target.