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Time jumped forward

Hi folks,

I am receiving some error messages from everything that uses planning_environment (OMPL, Trajectory Filter, you name it!), namely that the joint_states messages are discarded and I should turn DEBUG on. When I look at the DEBUG messages, I see a dominant "Time jumped forward by xxx for timer of period [0.010000], resetting timer". Although I don't think that that is the problem, I was curious about this message. What does it mean? Is it bad?

BTW I am currently distributing the nodes among at least 3 computers. Although they query a local ntp server every minute, keeping them in sync is a big problem. How influential is this on the tf synchronisation problems?