Wrong Sell Price

[Drueric]

Candied Spider is listed at 8c to buy, and 4c to sell. however, if I buy a stack of them, I pay 1g,6s which is correct, but if I sell a stack of them to vendor, they only pay 4c, the price of a single item. Should be getting 80c. (4cx20)

I tried to printscreen this, but for some reason it only pastes a black screen. Not sure why. Print screen used to work for eq. Might be a display setting thing.