How to detect multiple objects for avoidance

Hi Everyone, I have three 3D objects that move with A*pathing. I am testing some local avoidance code that is basically supposed to repel units from each other. The code detects surrounding units from a list and if they are too close it pushes them away. It works for two of the objects but not the other. Could anyone tell me why this doesnt work? I have the code im using below and a screenshot of my display here: http://imgur.com/2rkCAjg (code works for the bottom 2 units in the picture)

 public void LocalAvoidance(){
         //get drawn ray between all units
         for (int i=0; i<UnitsList.Count-1; i++) { //this iterates through my list of unit objects
         for(int y=0; y<UnitsList.Count; y++){ //this iterates again through the list to make sure we capture all objects
         
             Debug.DrawRay (UnitsList[i].transform.position, UnitsList[y].transform.position - UnitsList[i].transform.position);
                     //this draws a ray from unit to unit
         
             float distance = Vector3.Distance (UnitsList[i].transform.position, UnitsList[y].transform.position);
                     //this calculates the distance from one unit to another

             if (distance <= 3) { //if the distance is less than 3 push the unit away

                 Vector3 direction = Vector3.zero; //creates zero vector

                 direction=UnitsList[i].transform.position - UnitsList[y].transform.position; //gets the direction vector

                 transform.Translate(-direction*6*Time.deltaTime); //pushing in the opposite direction of the movement.
             }

         }

         }

 }