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:

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.

I can finaly post pictures, here is the result