When there are only reports from within the last 24h for a given host, visiting the host show page for it will say at the top:

"Reports from the last <blank dropdown menu> days - 2 reports found"

Even though there are reports from within the last day, the dropdown menu doesn't list "1" as the first and only value.

This is clear on an initial installation of Foreman where you have a single report from the Foreman host itself.

(https://bugzilla.redhat.com/show_bug.cgi?id=1070400)