A Stop Limit does not guarantee that an order will be filled after it has been triggered. Note that orders at each price level are filled in a sequence determined by the rules of the PSE. There is no assurance that all orders at a particular price limit will be filled when that price is reached. It may happen that there are not enough buyers/sellers at your limit price or better on the day your order is activated.
Also, orders created by a Stop Limit remains in effect only for the day. It expires at the end of the trading day if not fulfilled. You are advised to monitor your pending conditional orders from time to time especially during volatile market conditions.