Why could trips and units fulfilled mismatch in the scenario implementation tab?

Both the trips and the units fulfilled are shown in the summary part of the "Implementation" tab and are updated in Nextail once the receiving store confirms the reception of the units. 

The trip is confirmed once the receiving store confirms the reception of the first unit, but on that trip, all units proposed by Nextail's calculation might not be taken; therefore, an imbalance between these two results is created.

Note: For better scenario implementation monitoring, please refer to "Units" information.