There are higher Emails Delivered counts for some email campaigns than Emails Sent counts in the Campaign Performance report.
- Studio > Analyze > Campaign Performance Report
The number of emails delivered should be, at the most, equivalent to the number of emails sent. These counts are shown as higher than the send counts in some cases.
This issue is still under investigation. Please check the current status of this issue on the Known Issues Tracker. (Issue ID: ME-2037)