Currency Exchange

[Husoc]

Hi. I apologize for my english, hope you will know what i mean. 
I have a problem. I want buy some Hongmoon Coins or Ncoins for gold in game - Currency Exchange. 
But when i see this: 
http://screenshu.com/static/uploads/temporary/1l/h8/fu/ot7wzb.jpg 
I dont know what to do.. the left side of this window is written Hongmoon Coins, but once I confirm the auction to show me NCoinsy. What in the end I get because I'm confused?