Let's assume that you have placed a sell stop loss with a trigger of 95 and limit price of 95.50. When the LTP of the stock touches 95, the stop loss order gets triggered and looks to sell the stock at the limit price of 95.50 (as mentioned) or any other price higher than this.

If due to volatility, the stock touches 95 but immediately after that it drops down to 94.5 without touching 95.50, then your order will get triggered the moment the stock touches 95 but will not get executed as the limit price of 95.50 was not touched.

Therefore, in case of Sell SL, it is always preferable to keep your trigger price slightly higher than the limit price.

This will be vice versa for buy stop loss limit orders.

Let's assume that you have placed a buy stop loss with a trigger of 95 and limit price of 94.50. When the LTP of the stock touches 95, the stop loss order gets triggered and looks to buy the stock at the limit price of 94.50 (as mentioned) or any other price lower than this.

If due to volatility, the stock touches 95 but immediately after that it moves up to 95.5 without touching 94.50, then your order will get triggered the moment the stock touches 95 but will not get executed as the limit price of 94.50 was not touched.

Therefore, in case of Buy SL, it is always preferable to keep your trigger price slightly lower than the limit price.