Shouldn't Visits by Visit Number count Unique Visitors?

[and their respective number of visits].

If a visitor has two visits, there should be a tally for 2 visits during the period.

In other words, if you total the Visits for the Visits by Visit Count table, (under Visitors > Engagement), that total should be equal to the total number of Unique Visitors since each Visit Count is assigned to one unique visitor?

What am I missing here? Why is my sum(visits) larger than my unique visitors for that table?