Earlier I noticed this on the homepage:
That's a question I asked at the beginning of the month, but someone else's name is next to it. At first I thought they answered or edited it, but it doesn't look like they did. So...why is it there?
You have the right idea that if someone answers or edits a post, the question gets bumped to the front page. And that's exactly what had happened. Someone added an "answer" and I then deleted it on the grounds that it doesn't answer the question. (It was a "me too" post.)
Since they made a post on the question, their name is on the question now. Hope that makes sense.