Unfortunately a exploit from the site has arose where as items are being traded off by bots for the improper price than stated on people's trades.

The investigation of this incident is currently underway. Here is what we know as of now:
1. The hacker forged the information between the client and the server causing this.
2. Joto added him to talk who he also returned some items.
3. Bots on the site are currently shut down pending investigation.
4. solaris32 has reported and marked the hacker as a scammer.
a. http://steamrep.com/profiles/76561198055639592
b. http://steamcommunity.com/profiles/76561198055639592/

That is all I know as of now.