it seems based on the facts the execution price was too far away from the last price to be accepted. this is regardless of the actions by the OP even while including the possibility of a fat finger error.It would be helpful to know what the best bid was at the time your order was submitted. Are you sure it was not $8.85? I see bids and offers like that all the time (that are 1 digit off the real last official price), trying to entice people into seeing what it is not really there. Why would your broker submit your order at $8.85 unless that happened to be the best bid at the time?
I don't want to accuse you of making a mistake you didn't make, but there is no reason to think that any software on Earth would modify the price of a limit order from $18.85 to $8.85. There has got to be a better explanation than the one you have presented so far.
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