I found some differences at reports in Adobe Campaign.
When I visit the report area and filter the selected deliverys I can see one number of processed/sent e-mail (attached image report_campaign.png). When I export data from Campaign to excel files to see the data in details, this number (to processed/sent) is exactly the same. But when I make the same comparison with delivered e-mails, the excel file has more rows then showed in report.
I have 5407 x 5193 showed in the image to Delivery1 and 5416 x 5180 showed in the image to Delivery2.
To find the deliverys, I used the methodology presented in this article:
Please elaborate on how you're exporting the data - is it through a workflow or using Download CSV option in the report? Download csv would give the same exact data and there is no status filter so I think you might be using Extract File in a workflow, please confirm.