According to the trading system of MT4, every order (including stop loss and stop profit) is closed at the market price after the price you set is triggered. But due to a heave fluctuation or bad liquidity in the market, the actual transaction price is likely to be different from the price triggered, namely slippage. Generally, the stop loss would have more negative slippages.

I went long 0.2 lot of gold with the stop loss set at the level of 1818. However, my stop loss was trigered at the slippage of 1816.56 without any market fluctuation in the daylight.

Dear customer, please provide your correct name. Thank you for your cooperation.

Slippage in daylight. I clearly set a stop at 1818, but he gave me a direct slippage to 1816.56 to stop the loss.