Bizzare behaviour: Unit gets so far and then starts randomly moving to previous tiles

When a certain amount of units are pathfinding, they all start to behave really poorly - they keep jerking back and forth between what should be their current node and a random past node of theirs. I’m assuming this isn’t intended behaviour, but I cannot find a solution at all.

This is using the Grid based solution.

See -> Problem1. It is the same issue as yours.

I assume you are not using the AIPath script.