Not sure if this is this bug, but half the time it seems like i'm trading 2 of my luxury resources at once.
Say I have 2 gold, and my advisor advises me to sell it to the ottomans.
So, I go to him, ask him what he wants for gold, etc etc, deal is done.
Now, I don't remember what caused me to think I traded both, but I think it was because my happiness went down.
On a related note, on the trade screen, what determines which luxary resources show up on your side?
Say I have salt, gold, fur, wine, and sugar.
If I go to Pacal to trade, gold and wine show up. But if I ask Oda, sugar and fur are there.