I installed the update as soon as it came out on the 29th, and then a little after midnight on the 30th I received a notification from Notification Center that a new Security Update was installed. So, I thought maybe Apple released a revised version of the new Security Update or something, but when I checked in the App Store it was the exact same update installed twice. Odd. Screenshot included of the App Store showing it was installed twice on two different days. I know it cannot really hurt my machine, I am just wondering what happened? Thanks in advance!