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There are a couple of things that could be causing this:

• The global planner chooses a path that isn't very straight, and the local planner follows it
• The global planner chooses a straight path, but the local planner overshoots and oscillates when trying to follow it
• The robot itself has some momentum, and the base controller that's driving it is under-damped, causing the system to oscillate.

Without more information, it's hard to say which of these is actually the problem. Screenshots or video of rviz visualizing the global and local plans would be a good first step.