[Can't afford to sell]

Update, now my game is overstocked. Jeez.

[Can't afford to sell]

So when I attempt to sell a copy of the steam game titled "Super Meat Boy" I'm greeted with the usual of joining the queue. Nothing unusual there. But after a short while I experience an error informing me that the trade was empty, meaning my item was either overstocked or I could not afford to pay for it. I considered this to be very odd as when I checked, the game in question was not overstocked, nor did I lack the means to sell this. There is no restriction on my Steam account, I have the mobile authentication in place and everything looks hunkey-dorey from my end of the stick. However, game banking seems to believe that I cannot afford to sell my product, despite me both owning said game in my inventory, and the stock of the bot in question having space for my copy in it's stock. Here's my screenshot of the ordeal as attached.