Okay so they’re not blocking the navmesh.
I notice you have a small box on the front of them, what’s the collision for that? Make sure it’s set to Ignore or Overlap only so it doesn’t block them.
Other than that, yeah it looks like you may have to resort to using the base AI Controller (not detourcrowd) if they’re refusing to pass through each other. Then if there’s STILL a problem maybe you can work towards using detourcrowd again- you can change the parent class of your AI Controller in the top right of the AIC blueprint! Give that a try!
Also- maybe don’t use that new collision channel? You should only need to use Pawn and set them all to ignore Pawns.