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While I can not say how or why, if I were you I would upload search.php from the 2.9.2 core again...
I have a site running the same theme (imagio6or8, whatever it is) and my search results do not look like yours.
Without digging around in the code it appears that search.php post to itself, so the problem may be solved by re-upping...
Try that and post back if it does not work.
GL