Market error

Seems that if you put one (1) item on market for lets say 5 pounds, and then put up another one of same item, but you change price to 6 pounds, then you will somehow have 2 for sale at the first which you used.. in this case 5 pounds.

Id like to know if this is some kind of error, or is there some law that says you can only sell 1 item-type for one price ?

No its the way the game is coded. Town hall also can only sell things for one price. I have often had to cancel a sale in order to get cheaper goods into the hands of those working for the town. Its a pain but the way the game works atm.

I guess its the only way from stopping people to put up 10 of same item at different prices (why anyone would feel the need to spam the market is another question..)

But every coin has 2 sides