With the patch today, some bugs have crept in again! If you sell items while your character is offline, the gold does not end up with you, but disappears!
You have read correctly! You will not get any gold when logging in! The Dev Team is working on it and says: Players who encounter this issue WILL receive their missing gold/items when the fix goes live.
Of course, this is a bug and does not have to affect every player.
If you don’t have to pay your rent urgently, I would recommend you not to set anything at the trading post when you go offline.