are you pulling this number from your members program status?
Program are like one way streets, you can only go one direction and not backwards, as you move from sent to delivered, the number at the sent stage added to the number at the delivered stage should add up to the total members of the campaign. The table below shows me at which stage each of our leads are at........
We have a total of 67
19 are still at the delivered stage
8 are at the open email stage
1 has clicked the link in the first email
2 have now moved onto the same day reminder send (but not delivered yet)
14 at the delivered SDR stage
and so on
If you add up all the numbers it should add up to the number of leads in your campiagn in my case its 67