Slippage is an inherent part of financial markets. Whether you’re trading stocks, futures, commodities, or forex, you’re all subject to slippage. When you place a market order, you require your order to be filled at the currency market price, but if the market changes between the time you place your order and its fill time, your order may be filled at a different price. When the market is volatile, such as in a new period, slippage may increase, and you should keep this in mind when you are trading outside of the normal range of market conditions.
Stop-loss orders enter the market as a market order when they are triggered, so they cannot guarantee that your order will fill at the price you set for your stop-loss.