This is the second Heroic Boss event where I notice that the refresh times are off: it usually refreshes at 9AM (GMT), but only the normal Boss event does, the Heroic nodes stay closed for another 8 hours. They should refresh at 5PM, so will check again then and get screenshots if it happens again.
Heroic nodes refresh on a 12 hour time, compared to 8 hours for regular. Been this way since the second Heroic from Broken Circle. The Boss itself still refreshes every 8 hours for both versions.
Thanks, I should have noticed this