The default sort order for all the submission is now the most recently added/modified/commented on. Whichever is most recent of those three criteria will result in the top spot.
So if you comment on an item, that item will now become the #1 when you go to the items page. Same thing if add a new one or modify your old submission (don't abuse this).
To see the most recently ADDED submission just use the sorting link "Most Recent" and it will put you back to the old sort order.
The new order will unhide some of those submissions we want to discuss as well as giving those that modify their submissions the chance for others to see the improvement.