Wrong NPC prices

[Lucas3]

I found a small ,but very annoying bug +4 blessed weapons sell for less than +3 weapons(A FAQ also told me +4 are more than +5). I already asked a few people about this and everyone told me it always has been like that and it's not fixed yet, but I can't really understand why. How hard can that be? Change a few numbers and finished. It's quite annoying and it can be easily fixed. Now always when I bless weapons for money I have to watch out to bless exactly +3 because else I get 450 plat less. Please, do something!

(Sorry the screens to this are german because I have german Graal)

Edit:Ok , just tried it with flame swords. With these it works fine and +4 is more expensive than +3. I don't get the price system of GK , with some weapons it works with other not.