I answered a question this morning. A little later I noticed on the list-of-recent-questions MSE homepage that I had "modified" something there instead of "answered." Neither my answer nor anything else at the question indicate any edits (by me or anyone else), so I'm just curious why the homepage thinks I modified instead of answered.
This isn't a screenshot, but here's what I grabbed from the recent-questions list:
Prove x3+3=4y(y+1)x334yy1 has no integer solutions algebra-precalculus elementary-number-theory proof-strategy modified 27 mins ago Barry Cipra
Added later: I should perhaps clarify that the MSE homepage I'm referring to has url simply "http://math.stackexchange.com" (with nothing extra after the "com"). Here's a typical screenshot of what I see:
The activity status is a mix of "asked," "answered," and "modified." The "modified" indicator normally means something has been changed, and the change can be found in an appropriate edit history. But, again, there were no edits of any sort at the question I'm asking about. So I'm just curious how that status got attached to my answer. (It's not a big deal that it did, I really am just curious.)