Hummingbird plugin is reporting downtime, but no outages?

I started the hummingbird plugin last week, and today i checked the dashboard and it's reporting that my website has 0 outages, but 7H 36M of downtime. how is this possible?

also... in the Uptime page, in the dashboard on the right (where it lists uptime, outages, downtime) it says Last Down was March 11 @ 1:57.... further down the page, under Downtime (where the logs are listed) it only lists Mar 9 @ 8:56pm.

How can a site be down but not out?