Odd AI movement bug?


While using 4.62.2 I have encountered an unusual problem. All of a sudden my AI stopped moving through a specific level in walking mode. If I place the same AI in a different level they will move no problem, but back in one specific level they cannot move.
I checked navmesh, collisions, world locations, collisions etc.

It was working fine, and all of a sudden it stopped.
I really do not know what else to check.

Anyone have any thoughts?