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Hi Robert, Lightspeed Trader is generally an excellent platform. Has the bug where if you have an existing order waiting to get filled and there is a change confirmation box up, as soon as the original order gets filled the change confirmation is immediately removed and automatically reinterpreted as a new order? For example if you have an existing buy to cover order at 35.50 with the stock trading 35.52 x 35.54 and you're not sure if you'll get 35.50 so you're contemplating changing it to 35.53, if that stock does spike down to fill you at 35.50 the change confirmation to buy at 35.53 is taken away and filled as a new buy order at 35.53 which results in you getting long a stock that you just covered. It's a pretty serious bug where you can't contemplate changing an order that might be about to get filled otherwise an order that you didn't actually place will get placed as well.
I'm not aware of any "bug" where when modifying an existing order both orders have been filled. It is my understanding the new order is only sent after the cancel has been received. The modified order is a new order with a new order #.
Maybe I didn't explain well enough how it happens. The modifying order was never sent, so there can't be a cancel and replace on the existing order. The yes/no buttons in the confirmation box were never touched, yet Lightspeed Trader will every time on it's own remove the confirmation box from the screen and act as if it received authorization to send a new order. It is the only platform I've seen do this. In Sterling, if I'm waiting to modify an order and it gets filled, I have to create and send a new one because the one I thought about modifying is over and done. Any other platform, if you're about to modify an order and it gets filled, it doesn't automatically take that modification as sending another order, it'll say order can no longer be modified.
From what I read, you are saying that when I right-click on an open order, click modify, that you can get an execution on the old order then hit send and get another. I'm testing that right now and that did not happen. As you can see in the picture, once I hit modify, the old order was filled while I had the modified order ticket active. The next box popped up.
If it was fixed that's great, it has resulted in many a unsent confirmation turning into an unintentional order. I had to learn that when I'm really close to getting a fill, don't have the yes/no confirmation box up. Your scenario is right, but it's hard for me to say that it's replicated because it's not having an order modification up, it's the next step of the yes or no to send the modification order when the original order is filled being up that resulted in however you were going to modify it being a new order.