please check this:

2016-07-15 07:50:12 Sold 1 Iron Ore (for 5 satoshi) 2016-07-15 07:49:58 Purchased 1 Iron Ore (for 20 satoshi) 2016-07-15 07:49:28 Sold 1 Iron Plate (for 70 satoshi) 2016-07-15 07:49:23 Sold 8 Iron Ore (for 216 satoshi) 2016-07-15 07:49:15 Sold 1 Iron Ore (for 27 satoshi) 2016-07-15 07:48:36 Burned 1 Iron Ore 2016-07-15 07:48:27 Purchased 3 Iron Ore (for 27 satoshi) 2016-07-15 07:46:26 Refined 1 Iron Plate

i buy iron ore for 9 each, then was bugged and for a few of seconds, i sell iron ore for 27 each and i buy for 20. Sry for my english :P

Thanks for your report! That was indeed a serious bug.