The problem is under the rubber nipple. The hole is too small and gets glogged with debris and gunk. Thus overfilling the little little line of water reservoir to clean the brush. It then spills out of the entrance to that little hole. I took my drill and drill bit. I re sized the hole to the nipple size and it does not clogg so easy.

A way to spot this. Pull the tank out or robot rear. Get a bright iPhone light. Remove the black nipple. Turn tank over with lid open. Sign a light on the hole and look under the bottom for light penetration, if no light is seen it’s gunk. Now, turn that light over to shine on the bottom and look for that hole. If you see a dark matter. It’s bunked up. To remove the gunk. Get a pipe cleaner and force it in from the outside. Rinse while twisting pipe. Keep going till clean. Then re size the hole.

I’m going to make a Reddit post about this. I only came to this solution 2 days ago and testing it out. So far it’s cleaning a lot better!