Colormap not aligned to terrain

I have a terrain 4033x4033 , colormap use landscap layer coord with 4033, my texture is not aligned to the terrain, seem like just underscaled, i tried 4090 but it go to large, tried around 4040 but texture is overscale in Y

Ok i figured out, since ue4 import in 4096, and the terrain size is 4033, i had to cut my colormap in gimp to fit the pixel ue4 delete