I have 15 Hosts with “ntp” in their name, but the Overview shows 96.
Your screenshot - especially the Tactical Overview on the left - seems
to be the result of the search option in the leftmost navigation bar.
The search query for the Tactical Overview, however, looks for both
services and hosts matching your search, as you can further inspect when
clicking on “Tactical Overview: ntp”.
Thus, might it be possible that each of your host has a “ntp” service?
Maybe you want to post two additional screenshots: one of the Tactical
Overview when following the link, as written above, and one with an
altered search query to exclude everything service-related from the query.