I just did a quick scan of the last 9 challenges. Every one except one shows at least one person doing an edit. They don't always say what they did but they could be entry changes.
Edits maybe, color/contrast tweaks maybe, but no entry changes on 69, as I judged that one. I wrote down what the picture was, entered by whom, & sidenotes on each one before I actually picked the winners. I also have gone back to read alot of the archives.
I guess to each his own as far as the judging and to each his own as far as being confident enough the first time with his/her original entry.
Good luck on the next challenge. 