To leave a comment, you're supposed to just type the message and hit enter. But it doesn't always pop up right away. So sometimes you hit enter again, thinking it didn't go through. And then again. And then there are multiple of the comment!
When I left a comment for the first time, I wasn't sure how to post it. So you should add a button to make that clearer!
And a delete comment feature would be nice to get rid of the duplicates of the comment accidentally posted.