Quest Bug: "Not enough goods"

I can't find this mentioned elsewhere....

For the quest "Not Enough Goods" where you have to buy at lest 100 Iron Ore from other players, I have so far bought one batch of 100 listed for sale, traded copper ore for iron ore via "sell", bought another 400 iron ore for coins, but it still hasn't completed the quest!

Are you sure it isn't a "Waiting quest".

Waiting quests are quests you cannot do yet. You need to complete another quest first, in this case the one you still need to do is probably a "Daily quest".