If I'm not mistaken, that is an orphan block (I don't know if that is the correct term). As per MrEggman, "Orphans are a normal part of PoS coins. It is part of the effect of competing vs others for a stake. They won you didn't." I encountered that few days ago. The only thing that you can do is wait for your inputs to mint again. Take note that it will continue with your previous coin days so you are not missing any reward.