See attached. In today Mini S&P ES 09-12 2min chart, there is a gap down in IB chart, 1 ticks from 1325.75 to 1325.50. And it is a red bar with long tail. For NT chart, it is 2 ticks from 1325.75 to 1325.25. And there is no body for the candle, just a long tail.
Why is that so?