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Your SL order can trigger even if your charting platform doesn't visually show that price. This happens because exchange systems record every single price tick, but charts often smooth or aggregate data, especially for less liquid F&O options. A quick, momentary spike in the option's premium on the exchange can hit your stoploss trigger price before your chart updates to show it, or before it's even recorded in the chart's historical data.

Bottom line: Charts don't show every single tick. Your stoploss is executed at the exchange level, not based on your charting platform's real-time visual updates.