The reason is that you are adding new links and it automatically adds links to the What's New in the last fourteen days. In terms of the Cool page, the links added will be put in that page unless you edit the $popular_cutoff variable to something else like a percentage (.01, .10, .05), which only display a percentage of links in the Cool page.
Hope this helps.
Regards,
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Eliot Lee Anthro TECH,L.L.C
www.anthrotech.com ----------------------