How to stop moving back or stop choosing another AI's path?

When AI moves towords the target suddenly it goes back and choose another path and back to its path again.
I am using AIPath script.

Hi

That looks odd. Something like that shouldn’t happen unless the pathfinding system was extremely overloaded.
How many agents do you have in that scene?

Thanks for the reply. I have only 15 agents. I solved it by making node size to 5. Is there any other way to solve it? Actually I can’t find any reason why its happening. And also how can I check pathfinding system is overloaded?