In some cases where it would place the Buy and Sell simultaneously (as it is supposed to) one of the orders would be wrongly placed.Are you using Stop or Limit orders? Could you please provide some screenshots and more explanations? Because I've just tested it all and it opens correct orders.
Using this "Buy/Sell" function in "Pending order by Distance" means that both the buy and sell orders would have the same stoploss. But it doesn't always work that way.
Just like in the picture attached, the EA sometimes uses the "stoploss" as the "open price" of the sell order.