Others have had that problem. I'm not sure. I use fidelity, I don't know if that matters but I had an order for .18 at open and it filled at .12 Maybe some kinds of lucky. But it helps, I think, to have your order in before it gets there. Almost like a first come first serve. I put my order in for .20 when I sold at .27. again this may not matter but thats what im thinking