I'v a question/remark about version 0.8 (latest)

I wanted the bot to sell all my bitcoins i had with the high/low bot and selected the all in option.
After a while the boundaries where reached and the trade was made. I got however stuck with 0.0073 BTC, for which no sell order was made.

A closes look showed me that not the complete amount of bitcoin a sell order was given for, but a portion was not sold, for which i assume the fee had to be paid off.
But either the calculation is wrong, or the fee is paid from the sales value, and no reservation should have been made for that (when trading manula on the btc-e, If i would sell all, i can sell all and fees are just subtracted from the sale earnings)

Is this bot behaviour done by design, or did i find a bug?