I just edited this post and reloaded the front page. It had already updated the topic (the one with 10 up votes) to include my modification (55s ago Daniel Beck), but its position was out of the usual, chronological order. I have never seen this behavior before: Either nothing was updated (i.e. no recent modification by me) or everything, including the position.
After another minute or so, the topic took its expected position at the top of the list.