Hi Nchele,
Here is what happened. The FTMO robots have an internal Average True Range (ATR) indicator built into them such that when the range of a candle increased significantly it will close the trade. Here is what it looked like on the chart. When the 15 minute candle drawn on the chart due to NFP news event increase significantly the ATR (blue line) moved upward crossing the signal line (red horizontal line) and triggered the robot to close the trade. The reason the ATR closes the trade is because sometimes after a wide ranging candle the trend will change directions and start losing. The ATR helps to keep a profitable trade from turning into a losing trade.
Alan,