Urgent I CAN PRINT ESSENCE

hi, there is a bug on currecy exchange, when i whant to sell "essence of haste x10" i sell it, i recive 3 ex, BUT i receive 10x essence of haste too. i don't know why but i can print it ( i did it 10 time sorry i need to do to be sure)

in fact... i can print essence becuse i did the trade and i take the 10 essence with cancel trade and i have +10

i don't know if you see what i mean, sorry for my bad english :S