that is surprising with Zecco--Had that problem with Scottrade in the past---Check to see if you have old order in already and that is why it might be cancelling--Zecco will cancel if you already have another order in
They might do that to protect a newbee if they buy at market price...Years ago when i started i got burnt on a market order...Go SAVW TRAIN , keep on chuggin... :)