First, please ensure that the price did in fact go through your pending order level without being executed. You can do by referring to the chart itself.
Secondly, please ensure that you have sufficient margin in your account to cover the position. If the price did reach your predefined level but the order was never triggered, perhaps your margin dropped below the required level (as a result of other open positions) and prevented your order from being executed.
Remember, for pending orders to sell, the BID price must get to your predefined level, for pending orders to buy, it’s the ASK price that has to reach your specified level. If you have any further questions, please contact our support team.