A game I wanted to get is quite cheap! Let's purchase 2 CS:GO case keys and buy it from here! http://puu.sh/7bqQ4
Oh, you actually only accept TF2 keys and I wasted 3,58 euros. http://puu.sh/7bqOf

Other bots that sold games I wanted for CS:GO case keys acted the same.

I'm actually sure it's a bug, but I was quite frustrated when it happened.

I will have a look at it. CS:GO items are sometimes recognized and sometimes not, no exact idea why actually.