I just tried to submit https://www.theguardian.com/world/live/2016/jul/15/turkey-coup-attempt-military-gunfire-ankara https://www.theguardian.com/world/live/201

I just tried to submit https://www.theguardian.com/world/live/2016/jul/15/turkey-coup-attempt-military-gunfire-ankara https://www.theguardian.com/world/live/2016/jul/15/turkey-co... and rather than upvoting an existing submission like usual, HN tells me "Message Sorry, that story was previously submitted". What's with that?