Render texture copy to splat map problem

Hi, i'm modifying renderTextures in a compute shader thrue this simplified code: Compute shader

     RWTexture2D<float4> splat0;                                    // splat map
     RWTexture2D<float4> splat1;
 
  [numthreads(8, 8, 1)]
 void UpdateAll(uint2 id : SV_DispatchThreadID)
  {
    splat0[coord] = color0;
    splat1[coord] = color1;
 }

Then i copy the render textures directly into my terrain splatmaps like this: C#

 Graphics.CopyTexture(_splat0Temp, splatMap0);
 Graphics.CopyTexture(_splat1Temp, splatMap1);

But something is going wrong (I can't show you here how cause when i try to upload an image or a gif i get this error "Error parsing the uploaded file." so i will try to explain it...)

When i zoom in the modifications shows up but if i zoom out modifications fade out, maybe this is something due to mip maps but i don't know how to resolve it.

If someone is having a clue of what's going on, i would be very happy to know. Thanks