Sometimes, them moonrise is on the prior day, so the moonset for today is early today while the moonrise is later today.
I'd not put code in the ajax-dashboard to detect that and display moon set, then moon rise.. just lazy, I guess. Also Mark is correct. For some high latitudes ('midnight sun' areas), the moon can have weird times for rise/set (or have those times missing entirely if the moon is/is not visible the entire day).