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Adding a comment displays it at the end of the visible five comments, not the actual end
When a post has more than five comments, the comments past the fifth are hidden until you click 'Show more comments'.
However, when if you don't click on it and you add a comment, it will display it at the end of the currently visible comments, i.e. it will look like the sixth comment instead of the last. (This is a purely visual bug though, refreshing shows it as the last comment.)