Raycast passes Collider

When I fire a Ray it will pass a Box Collider assigned to a humanoid model roughly 50% of times (I'm checking it with Debug.Log, please see below). Naturally, I'd prefer getting a hit each and everytime the model is clicked. I'm pretty much running out of ideas.

Code is below. Please see also the image.

 private void Update() {    
     if (Input.GetMouseButtonDown(0)) 
     {
         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
         RaycastHit[] hit;
 
         hit = Physics.RaycastAll(ray);
         
         for (int i = 0;i<hit.Length;i++)
         {
             Debug.DrawLine (ray.origin+ray.direction*10.0f, ray.origin, Color.red,10.0f);
             Debug.Log("Collider name:"+ hit[i].collider.name);
         }
     }
 }

You can see the ray hitting the Box Collider but on this occasion I didn't get notification. However, when trying again, I might get it or might not. Totally non-deterministic.