When you add up all the visits from the individual projects and compare it with the number that is shown as the summary number for all visits to your site, there is a difference. We should expect to see this difference, here is why: 

The summary report number is simply the total count of visits to the site, whereas an individual project can have not only visits from participants who wish to see this project, but also from the participants on other projects. This adds to the visit count of the project.

Let us use the analogy of a Hotel. Let's say your site is a Hotel and your projects are the rooms. You might have had 50 people come through the Hotel door to stay with you (that is the summary number). Let's say that 30 of them stayed in the Project A room and then 20 people stayed in the Project B room. But then 10 people from the Project A room also went into the Project B room (for a party! ).

So your Hotel (the site) still only had 50 guests in total, but the Project A rooms had 30 guests enter and the Project B room also had a total of 30 guests (20 who stayed there plus 10 for the party). If you sum up every guest on a room by room basis, it looks like you had 60 guests in total, when actually just 50 entered through your front door. 

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