You might take this issue up with your broker as they would have the actual record of what happened. From you're saying, it could also be that you experienced a bit of slippage, where you placed a market order at a certain price, but that price was never hit and you got the best price instead. But again, it's hard to tell what happened without having all the info.
I don't think that your computer is entering and exiting trades on its own with no input from you. Demo trading for a while would allow you to make these mistakes without paying the price.
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