divergence order flow book in NT7

Hi everyone,
I state that I understand little
this morning I was watching ES 09-10 at 1min the chart with order flow mode (so the red or green candle with the Bid x Ask quantity for a single candle next to it), at the same time close to the chart I put the DOM, in practice I checked that at the end of time of the candle, when a new candle is formed the bid ask values ​​inside the candle were those that are beaten on the booK (which should be in ninjatrader those inside the round brackets close to the price), but a strange thing happened I saw loading first 1 piece on the book and on the order flow was fine because it appeared 1, then 2 on the book and in the order it said 3 then the book remained practically always on 2 (because in the early morning there is little movement , so do not splash the numbers fast) and half a second later I see 159 on the order even if there was no trace on the book even after continuing with quantity type 1 and on the order it gave 160, how is possible this ?? should all orders go through the book ?? it's a ninja bug?? or do it ??? , thanks to all