1) Trades sometimes don't show up in the "Selling" tab of Trade Office despite the fact they are actually listed and people can purchase them.
2) Trade History : Trades sometimes duplicate, showing twice, it seems this happens when a previously listed trade vanishes (either because it was deleted or because of bugs see below)
3) Trade History : Trades sometimes just vanish for no apparent reason.
4) Trading : Successful trades sometimes get reversed out, the trade vanishes from the history and the trade goods get reverted.