daenney
commented
7 years ago I can explain what happened in my case. When I click reply on a comment the viewport of the page scrolls back to the top, to the regular comment field, which suggests that's where you should type your reply. If you enter a comment there, it's posted as a top comment, which wasn't my intention, I wanted to reply to yours, but it wasn't obvious that that's what would happen. I realise the "submit" button is named differently but that isn't enough of a differentiator to trigger a "hey maybe there's another comment field somewhere outside of your view". Since I can't delete my comments I edited/blanked out my comment, hit reply again on yours and then scrolled back to the bottom where now a second comment field appears and submitted through that.
This only appears to be a problem if the comment you're replying to isn't on the part of the page (from the top) that fits on your screen as you initially load the page. So if I hit "reply" on a comment at the top everything's mostly fine as the reply field spawns within my view making it obvious that there's where I should reply. However, if the comment I want to reply to is a few "pages/scrolls" down, the rewinding of the page to the top makes it very confusing.
Oddly enough, even if you submit in the right comment field, it sometimes seem to render it as a comment instead of a reply the first time around.
In my case I'm using Safari Version 10.1 (12603.1.30.0.34) on macOS 10.12.4 but I observe the same behaviour on Firefox.
Occasionally seeing blank comments, would like to work out why.