The name ROADA_NEWKB might be causing confusion. The names specified in the tdf file are names that materials should begin with. The first material specified in the file is 'smooth tarmac', and its parameters will be applied to any material whose names begin with roada, roadb or rdaxroa, so your kerb material name will be treated as smooth tarmac. It's best to rename your material so it starts with rmbl (in XPacker or the material properties in BTB, there's an rFactor material name setting - choose rmbl).