Animation is not playing in touch mode

Hello...
Can someone help me, when i run my game on android, sometimes my jump animation is played sometime is not... When i run using computer, there's no problem.....Any help much appreciated.... Thanks..

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class playerAnim : MonoBehaviour
6. {
7.     public Animator anim;
8.  
9.     // Start is called before the first frame update
10.     void Start()
11.     {
12.         anim = GetComponent<Animator>();
13.     }
14.  
15.     // Update is called once per frame
16.     void Update()
17.     {
18.         //touch screen
19.           if (Input.touchCount > 0)
20.          {
21.          Touch touch = Input.GetTouch(0);
22.  
23.  
24.  
25.          if (touch.position.x > Screen.width / 2 && touch.phase == TouchPhase.Began)
26.         //if (Input.GetKeyDown(KeyCode.RightArrow))
27.         {
28.             anim.SetBool("isFlying", true);
29.             anim.SetBool("isIdle", false);
30.  
31.         }
32.  
33.  
34.         else if (touch.position.x < Screen.width / 2 && touch.phase == TouchPhase.Began)
35.         //else if (Input.GetKeyDown(KeyCode.LeftArrow))
36.         {
37.             anim.SetBool("isFlying", true);
38.             anim.SetBool("isIdle", false);
39.  
40.         }
41.  
42.         else
43.         {
44.             anim.SetBool("isFlying", false);
45.             anim.SetBool("isIdle", true);
46.         }
47.     }
48. }  
49. }