115799 - is the total number of Visits and Entries in May for those who have visited the page set in the segment regardless of whether that page was the landing page (entry page). For example, one visitor landed on the page SM|Home, the second landed on SM|Something. The report shows 2 Visits and 2 Entries.
However, when you look at the page SM|Home, the number of Visits is still 115799, but the number of Entries is now lower as it shows how many times somebody landed on this page. From the example above with two visitors, only the first visitor would be reported.