Multitouch second touch interrupts first, BUT is fine if the first touch is the third touch. WHAT!?

Hi all

I'm working on an Android touchscreen game. Left side of the screen steers, right side of the screen has buttons that do other stuff. Seems straightforward enough.

What I have: Left touch steers, but when I touch the right side, the first touchpoint is interrupted. The fingerId is still maintained, but moving that finger no longer updates the input number.

Bizarro behaviour: If I put two or more fingers on the screen FIRST (to the right of the screen), then start steering on the left side, THEN add more touch points on the right, the steering does NOT get interrupted. One finger first doesn't prevent the interruption, only two or more.

The last line is a debug that tracks the number of fingers on the screen and the fingerId of the movement finger. Both numbers track correctly.

Why!??! Help!!! Thanks!!!

My code:

 for (int i = 0; i < Input.touches.Length; i++)
         {
             //if no fly finger assigned and touch is on the left side
             if ((flyFingerId == -1))
             {
             if (Input.GetTouch(i).position.x < Screen.width/2)
                 {
                 switch (Input.GetTouch(i).phase) 
                     {
                     case TouchPhase.Began:
                         // code to run when touch begins here...
                         controlType = UseControlType.Mouse;
                         touchPointStart = Input.GetTouch(i).position;
                         flyFingerId = Input.GetTouch(i).fingerId;
                         break;
                     }
                 }
             } else
                 if (Input.GetTouch(i).fingerId == flyFingerId)
             {
                 switch (Input.GetTouch(i).phase)
                 {
                     case TouchPhase.Moved:
                     case TouchPhase.Stationary:
                     // code to run when touch is being dragged here...
                     touchPointOffset = touchPointStart - new Vector2(Input.GetTouch(i).position.x, Input.GetTouch(i).position.y);
                     break;
                     case TouchPhase.Ended:
                     case TouchPhase.Canceled:
                     flyFingerId = -1;
                     touchPointStart = Vector2.zero;
                     break;
                 }
             }
         }
 
         Debugui.text = "touches: " + Input.touches.Length.ToString() + " / flyfingerID:" + flyFingerId.ToString();