Path finding specification of CrowdManager(running in reverse?)

When you search the path to the goal by CrowdManager
When the CrowdManager searches for the path to the goal, some agents move unexpectedly.

Please let me know if you know what conditions should be met to cause this problem.
Please let me know if you know how to solve this problem.

■What happens?
Simply set up a destination on the other side of the wall.
If we set a destination on the other side of the wall, and send about 200 characters to the destination.
If you set up a destination on the other side of the wall, and have about 200 characters heading for the destination, only some of them will go backwards on the way to the destination.
After a certain amount of time has passed, the characters will head back to the destination.

If the route to the destination is crowded with other characters, it appears as if they are searching for a different route.
However, only some of the characters are behaving abnormally.
I haven’t figured out the conditions under which this happens.

If anyone can imagine the cause, please let me know.

Thank you.