Mismatch in interface utilization data

Hi Team,

I have created a report for Interface utilization. In which other teams have some doubts regarding populated data. Please see the below snapshot FYR.

Q:- The organization is asking, why the Average Transmit BPS Data + Average Receive BPS is not equal to Total Average BPS (Transmit+Receive).

Is there any justification for this mismatch in data?