That because they (3386,3387) there resized from 512x512 to 256x256 in official hrp (again, overoptimization!). Replace 3386 with one I posted here page back, and here is 512x512 3387:
http://members.lycos.co.uk/piterplus/download/3387.png (That texture is not mine, I just hold it here for a while)