Why does our e-mailed network summary differ from the amount shown on the Untangle itself for the same day. E-mailed report shows network usage of 2.7 gigabytes and 86281 sessions passed. Network Summary on UT shows 3.3 gigabytes and 100472 sessions passed for the same time. See screenshots

GV-E-mailed network summ.JPGGV-NetworksummonUT.JPG

I have also attached the report settings. Can someone help me out?