Of course, it really does not matter, because in WV, unlike most states, "county" is just a classification the WVDOH uses to mean, more or less, a lesser form of road, also under state maintenance. There are no county routes in the sense that an actual county department is responsible. So either a cartographer or a sign maker made a mistake. Given the condition of the road, my bet is the cartographer.
The source document would be the Commissioner's Order, which describes every road in language similar to that used in deeds, and which are often used to resolve who is responsible disputes between the state and city (lots of city streets are unsigned county routes and thus DOH responsibility) but these are not indexed nor on line.