Works on one gallery but not another

Hello, I've tried reposting, reinstalling, re-configuring. I'm using approved themes and software but the buy links only appear on one post but not another and I can't figure out why. Please help! The links to the two posts are below.

Correctly working post:
http://desmoinesguru.com/2011/09/28/t...

Not working post:
http://desmoinesguru.com/2011/09/29/o...
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