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You're probably running Gazebo and missing the use_sim_time parameter. Try the following:

roscore
rosparam set use_sim_time true
Now start launching the rest of your system.

The explanation is that the navigation stack was probably launched before the use_sim_time parameter was set (so it uses wall time: 1368081077.4015), and the thing publishing the TF transforms was launched afterwards (so it uses sim time: 136.4000).

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