The wrong wicks

There is a second way to end up waiting at a price that means nothing, and it has nothing to do with the market. It is a measuring mistake.

Four wicks, two of them right

Candle 1 and candle 3 each have a high and a low. That is four prices, and only two of them belong to the gap.

The direction of the move decides which two. Rising, you take candle 1's high and candle 3's low. Falling, you take candle 1's low and candle 3's high.

The direction picks the wicks. You do not.

The fake box

Take the other two prices and you still get a rectangle. It just is not a gap.