TickTrader charts are created using the bid price. 

• The closing of buy orders is triggered by the bid price, so you will see the candle hitting the Stop Loss. 

• Closing of sell orders is triggered by the ask price, which is not visible by default. That’s why stop losses on sell orders may occur at prices not seen on the candle.  

The Ask Line can be enabled on TickTrader by right-clicking on the chart and selecting 'Ask Line'.

Closing of buy orders is triggered by the bid price, so you will see the candle hitting the Stop Loss.