It sounds like you had the same luck I had yesterday in another one. I placed an order to sell 785,000 shs @.0009. The mm's filled 784,950 and moved the bid down a tic. Now I'm stock with 50 shs that are practically worthless.
kbtarl, unfortunately there is no rhyme or reason for the most part and most pennies move on pure momentum. As soon as that's gone they typically fall and people are onto the next play.