swipe repeating more then once

hi there is a slight problem in this code swipe is working with out releasing my finger but it is working more then once when i swipe my finger and stop with out releasing and swipe again with out releasing my finger then action is repeating twice can any one fix this problem action should be once per swipe with out releasing my finger here is the following code that i used

 if(Input.touches.Length > 0)
         {
             Touch t = Input.GetTouch(0);
             if(t.phase == TouchPhase.Began)
             {
                 //save began touch 2d point
                 firstPressPos = new Vector2(t.position.x,t.position.y);
             }
             if(t.phase == TouchPhase.Moved)
             {
                 //save ended touch 2d point
                 secondPressPos = new Vector2(t.position.x,t.position.y);
                 //create vector from the two points
                 currentSwipe = new Vector3(secondPressPos.x - firstPressPos.x, secondPressPos.y - firstPressPos.y);
                 //normalize the 2d vector
                 currentSwipe.Normalize();
                 //swipe upwards
                 if(currentSwipe.y > 0 && currentSwipe.x > -0.8f && currentSwipe.x < 0.8f)
                 {
                     lastJumpButtonTime = Time.time;
                 }
             }
         }