Page List Not Displaying in Correct Order

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I'm in the process of moving over about 300 news articles from our old website to the new one...going as far back as Jan 1st, 2012.

I'm setting the Page Public Date on each article (page) to match that of the old site when it was first published.

On my news page, I have a Page List set to display 10 pages, with most recent first and to display a pagination interface.

The firs few pages seem to be okay...but when I click on Page 6 (for example) I see articles from January 20th. Clicking on page 16, shows articles from January 17th.

Does the Page Public Date not work this way, or is something amiss?

Thanks.

leinteractive