Why does this shader mirror the texture

I have the following shader and I dont understand why the texture is being mirrored in my objects. I'd like to have the texture simply applied, no mirroring or double. Can anyone please signal the part of the shader that is causing this and how to change it. Thanks

Code (CSharp):

1. Shader "Clouds/Cloud Color Alpha Blend" {
2. Properties {
3.     _TintColor ("Tint Color", Color) = (0.5,0.5,0.5,0.5)
4.     _MainTex ("Particle Texture", 2D) = "white" {}
5.     _InvFade ("Soft Particles Factor", Range(0.01,3.0)) = 1.0
6. }
7.  
8. Category {
9.     Tags { "Queue"="Transparent+1" "IgnoreProjector"="True" "RenderType"="Transparent" }
10.     Blend SrcAlpha OneMinusSrcAlpha
11.     AlphaTest Greater .01
12.     ColorMask RGB
13.     Cull Off Lighting Off ZWrite Off
14.     BindChannels {
15.         Bind "Color", color
16.         Bind "Vertex", vertex
17.         Bind "TexCoord", texcoord
18.     }
19.  
20.     // ---- Fragment program cards
21.     SubShader {
22.         Pass {
23.      
24.             CGPROGRAM
25.             #pragma vertex vert
26.             #pragma fragment frag
27.             #pragma fragmentoption ARB_precision_hint_fastest
28.             #pragma multi_compile_particles
29.          
30.             #include "UnityCG.cginc"
31.  
32.             sampler2D _MainTex;
33.             fixed4 _TintColor;
34.          
35.             struct appdata_t {
36.                 float4 vertex : POSITION;
37.                 fixed4 color : COLOR;
38.                 float2 texcoord : TEXCOORD0;
39.             };
40.  
41.             struct v2f {
42.                 float4 vertex : POSITION;
43.                 fixed4 color : COLOR;
44.                 float2 texcoord : TEXCOORD0;
45.                 #ifdef SOFTPARTICLES_ON
46.                 float4 projPos : TEXCOORD1;
47.                 #endif
48.             };
49.          
50.             float4 _MainTex_ST;
51.  
52.             v2f vert (appdata_t v)
53.             {
54.                 v2f o;
55.                 o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
56.                 #ifdef SOFTPARTICLES_ON
57.                 o.projPos = ComputeScreenPos (o.vertex);
58.                 COMPUTE_EYEDEPTH(o.projPos.z);
59.                 #endif
60.                 o.color = v.color;
61.                 o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex);
62.                 return o;
63.             }
64.  
65.             sampler2D _CameraDepthTexture;
66.             float _InvFade;
67.          
68.             fixed4 frag (v2f i) : COLOR
69.             {
70.                 #ifdef SOFTPARTICLES_ON
71.                 float sceneZ = LinearEyeDepth (UNITY_SAMPLE_DEPTH(tex2Dproj(_CameraDepthTexture, UNITY_PROJ_COORD(i.projPos))));
72.                 float partZ = i.projPos.z;
73.                 float fade = saturate (_InvFade * (sceneZ-partZ));
74.                 i.color.a *= fade;
75.                 #endif
76.              
77.                 return 2.0f * i.color * _TintColor * tex2D(_MainTex, i.texcoord);
78.             }
79.             ENDCG
80.         }
81.     }  
82.  
83.     // ---- Dual texture cards
84.     SubShader {
85.         Pass {
86.             SetTexture [_MainTex] {
87.                 constantColor [_TintColor]
88.                 combine constant * primary
89.             }
90.             SetTexture [_MainTex] {
91.                 combine texture * previous DOUBLE
92.             }
93.         }
94.     }
95.  
96.     // ---- Single texture cards (does not do color tint)
97.     SubShader {
98.         Pass {
99.             SetTexture [_MainTex] {
100.                 combine texture * primary
101.             }
102.         }
103.     }
104. }
105. }
106.  

 

UnityGuillaume, thanks for your kind answer. I'm applying it to a very thin and large cube. Probably waht may be happening is that I'm seeing the reversed image in the other face of it? maybe a plane can help with this. I'll give a try and come back if I need further help. You've been of great assistance.