Processes two touches instead of one

Don't know what to do. I place double tap only once, but Unity thinks that it were twice. P.S. Not only with double tapping, but i tried test script which telling me about touches, it shows me the same situation - two touches instead of one. And if it is important, the ID's of touches are the same, at example I create object by tap anywhere on the screen (standart script), but it creates two and the ID's of touches are the same. Help ma please. And the script: using UnityEngine; using System.Collections; using UnityEngine.UI;

 public class FBSJ : MonoBehaviour {
     private bool ShowPowerSlider = false;
     public Slider slider;
     public float PowerSliderValue = 0F;
 
     void Start(){
     }
 
     void Update () {
         int nbTouches = Input.touchCount;
         
         if(nbTouches > 0)
         {
             for (int i = 0; i < nbTouches; i++)
             {
                 Touch touch = Input.GetTouch(i);
                 
                 if(touch.phase == TouchPhase.Began)
                 {
                     if(touch.tapCount == 2 && !ShowPowerSlider)
                     {
                         Debug.Log("1");
                         ShowPowerSlider = true;
                         PowerSetMode();
                     }
                     else if(touch.tapCount == 2 && ShowPowerSlider){
                         Debug.Log ("2");
                         ShowPowerSlider = false;
                         PowerSetMode();
                 }
                 }
             }
         }
         if (ShowPowerSlider) {
             PowerSliderValue = slider.value;
             Debug.Log (PowerSliderValue);
         }
     }
     void PowerSetMode(){
         if (ShowPowerSlider) {
 
             Debug.Log ("true");
         }
         if (!ShowPowerSlider) {
             Debug.Log ("false");
         }
     }
 }