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To solve this problem I had to add this line in morse_2dnav/nav.launch:

<param name ="/use_sim_time" value="true"/>

Moreover, I add to add these lines in the nav_tutorial/default.py

clock = Clock()
robot.append(clock)
clock.add_interface('ros',topic='/clock')

I guess that the problem had to do with a poor synchronization between MORSE and ROS. I hope this helps others.