Texture SetTextureOffset not working in only ipad2. how to solve it?

I tested it in PC, Android, IPad2 Air, and very well working.

But, only IPad is not working...

So, How to solve this Problem?

Shader :

 Shader "Custom/UVScrolling" {
     Properties {
         _Color ("Color", Color) = (1,1,1,1)
         _MainTex ("Base (RGB)", 2D) = "white" {}
         _ScrollXSpeed ("X Scroll Speed", float) = 0
         _ScrollYSpeed ("Y Scroll Speed", float) = 0
     }
     SubShader {
             Tags
         {
             "Queue" = "Transparent"
             "IgnoreProjector" = "True"
             "RenderType" = "Transparent"
             "DisableBatching" = "True"
         }
             Pass
         {
 
             Cull Off
             Offset -1, -1
             Blend SrcAlpha OneMinusSrcAlpha
 
             CGPROGRAM
 #pragma vertex vert
 #pragma fragment frag            
 #include "UnityCG.cginc"
 
             sampler2D _MainTex;
         float4 _MainTex_ST;
         fixed _ScrollXSpeed;
         fixed _ScrollYSpeed;
         fixed4 _Color;
         float _IsUseSetOffset;
 
         struct appdata_t
         {
             float4 vertex : POSITION;
             float2 texcoord : TEXCOORD0;
             fixed4 color : COLOR;
             UNITY_VERTEX_INPUT_INSTANCE_ID
         };
 
         struct v2f
         {
             float4 vertex : SV_POSITION;
             half2 texcoord : TEXCOORD0;
             fixed4 color : COLOR;
             UNITY_VERTEX_OUTPUT_STEREO
         };
 
         v2f o;
 
         v2f vert(appdata_t v)
         {
             UNITY_SETUP_INSTANCE_ID(v);
             UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
             o.vertex = UnityObjectToClipPos(v.vertex);
             o.texcoord = v.texcoord * _MainTex_ST.xy + _MainTex_ST.zw;
 
             //o.color = v.color;
             o.color = _Color;
             return o;
         }
 
         fixed4 frag(v2f IN) : SV_Target
         {
             fixed2 uv_Tex = IN.texcoord;
             /*fixed varX = _ScrollXSpeed * _Time;
             fixed varY = _ScrollYSpeed * _Time;
             uv_Tex = IN.texcoord + fixed2(varX, varY);*/
 
             fixed4 col = tex2D(_MainTex, uv_Tex) * IN.color;
         return col;
         }
         ENDCG
         }
 }
         
         
     FallBack "Diffuse"
 }
 

Script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class UVAnimationEffect : MonoBehaviour
 {
     UITexture tex;
     UI2DSprite sp;
     UISprite sp2;
     public bool isUseDirectSetOffset;
     public float animSpeed = 0.2f;
     public float scrollSpeed = 5.0f;
     // Use this for initialization
     void Start () {
         tex = GetComponent<UITexture>();
         sp = GetComponent<UI2DSprite>();
         if(isUseDirectSetOffset)
         {
             scrollSpeed = 0;
         }
         
         sp.onRender = (Material mat) =>
         {
             mat.SetFloat("_ScrollXSpeed", scrollSpeed);
         };
     }
     
     // Update is called once per frame
     void Update () {
         if(isUseDirectSetOffset)       
         {
             float offsetX = Time.time * animSpeed;
             sp.onRender = (Material mat) =>
             {
                 mat.SetTextureOffset("_MainTex", new Vector2(offsetX % 1, 0));
                 //mat.SetTextureScale("_MainTex", new Vector2(offsetX % 1, 1.0f));
             };
             //Debug.Log(offsetX % 1);
         }
     }
 }
 

Please Help me .. TT