I shorted TF right after the general market open yesterday and it ticked up a couple of ticks so I put a limit order one tick below my entry. But had a feeling it might sell off so canceled that order and it did selloff. But it's so volatile when I saw I was up about $40-50 in green in the P/L column at the bottom of the SuperDOM a few seconds later I entered a buy order and thought I had made that much by closing my position. But to my shock what happened is I was suddenly long while it continued to sell off. It was early here and it caught me off guard. At first I thought I had double clicked on the buy and closed the original short and bought another contract. But when I looked my original limit order was filled and my position closed with a one tick profit although NT didn't show that yet in the SuperDOM when it actually happened. So now I was seeing red in the P/L column.
So then I realized what happened. My original limit order was filled and I bought another contract below that where I thought I was closing the original position but instead creating a new long instead. I lost $120 by the time I got a handle on it. Not the end of the world, but just wanted to understand how this all works between the software and the data feed. Is this just a delay in data hitting the software? Unfortunately I'm limited to a WiFi connection now. Thanks.

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