That happens with a lot of lists if you happen to check them while they're being updated. As the new story is added the last changes.
Again: "This is not just the result of stories actually going in and out of 'about to be archived' status; repeating it gets the same inconsistent lists of stories."
At the moment, if you just click on the "Up for Archival" link on the Home page, it shows:
2. A Few Days With Aunt Jen
3. Bite Mark
4. Cuckolded by a Punk Rock Band
5. Farm Call
6. First Teen Experiences
7. Jill's Day Out
8. Macro's Story
9. Mother Is MILFed by Temptation
10. Nervous Virgin's Virginity Fixed (new version)
If you click to page 2, #11 is... "Nervous Virgin's Virginity Fixed (new version)".
If you then click to page 1, the list is:
1. Bite Mark
2. Cuckolded by a Punk Rock Band
3. The Dogging Virgin
4. The Donkey Solution
5. Farm Call
6. A Few Days With Aunt Jen
7. First Teen Experiences
8. Jill's Day Out
9. Macro's Story
10. Mother Is MILFed by Temptation
The bolded ones aren't displayed at all on the initial page. "A Few Days With Aunt Jen" moves from #2 to #6. "'Visions", formerly #1, doesn't show up until page 3, as #25.
On closer examination, it appears to be using a different kind of alphabetical sort (ignoring leading punctuation and articles) when a page is specified than when it just defaults to the first page.