Order Closed Before Stop Loss/Take Profit Reached

 
Please have a look at the screenshot I have attached. I set the stop loss at 1.15430 and left MT4 to do its thing. But when I went back to it, the order was closed and I had made a loss. What I don't understand is how this happened as the pair never reached that level. 
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Clifton Zama: Please have a look at the screenshot I have attached. I set the stop loss at 1.15430 and left MT4 to do its thing. But when I went back to it, the order was closed and I had made a loss. What I don't understand is how this happened as the pair never reached that level. 

The bars on the chart are based only on Bid prices, but a sell position is closed at the Ask price, which is the Bid price plus the spread.

The rules are as follows:

  • A buy position, opens at the Ask price and closes at the Bid price.
  • A sell position, opens at the Bid price and closes at the Ask price.