Duplicate Endorsements?


I am curious about something, if anybody has an answer. Are endorsements ever awarded more than once for the same category? I have seen on several different user pages, the ‘daily pick’ endorsement listed twice on that user’s endorsement section. I didn’t know if if someone could have the same endorsement twice but I do know that I have been privileged to have several of my images in the daily newsletter but have never been notified about this (after the endorsement was awarded) or awarded a duplicate endorsement. So, some users have duplicates, some do not. What gives?