Visits by days since last visit - Meaning?

In the report ‘Visits by days since last visit’, I only have the rows ‘New visits’, ‘0 days’ and ‘1 day’ filled with numbers. However, in the Visitor Log I can see that there are also returning visitors whose last visit was 5 days ago.

What could be the reason for this? Am I misreading the report?

I assume I should see there how many days ago how many visitors had last visited my website.