Italki's notifications don't refresh themselves unless you refresh the page. If you see nothing but a red number, a quick refresh almost always solves the issue.
2017년 2월 2일
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It's probably already been taken action on. You just need to refresh the page or log off and log back on.
2017년 2월 2일
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Try refreshing your page or logging out and then back in again. That might help.