for short order less than feed price, the volume display from GUI is wrong.
for example
106.2828 USD 50,000.00000 BTS 0.020000 % 0.0035 USD / BTS c09249efbc97c1f39c95158b12b2fa66c0ca7e99
the volume should be 25,000 BTS, and the ammount should be 25000 * 0.0035 = 87.5 USD
but the GUI display 106.78 USD