Why were my pending order/s cancelled?
First of all you should check the comment on the cancelled pending order in your account history (right click on ‘Account history’ and select ‘Comments’).
Comment ‘[closed/gap]’ appears if a pending order was placed with Take Profit or/and Stop Loss and the market price jumped over the order price and the price of the Take Profit/Stop Loss in gap level. An order like this will be opened by the gap price and subsequently closed by the market price with a commentary [closed/gap]. The final result of this order will be negative by one spread.
Comment ‘deleted [No money]’ means that at the time of your order being opened there was not enough free margin on your account to open such an order.