Sorun eklentide değil, temanızda... kaynak kodlarına dikkat ettiyseniz, iki defa header kodu var,
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<body>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head profile="http://gmpg.org/xfn/11">
<meta name="verify-v1" content="HIQkbIWcOW1Vu+WhFNtD+1IbWJsr/7ARhQYBGwkBOzk=" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title> Oyun indir, Oyun Download, Full Oyun Download, Tek link Oyun İndir,Oyun Yükle</title>
<meta name="generator" content="WordPress 2.8.4" />
<meta name="revisit-after" content="1 day"/>
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<link rel="alternate" type="text/xml" title="RSS .92" href="http://www.fulloyuninndir.com/feed/rss" />
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<link rel='index' title='Oyun indir, Oyun Download, Full Oyun Download, Tek link Oyun İndir,Oyun Yükle' href='http://www.fulloyuninndir.com' />
<meta name="generator" content="WordPress 2.8.4" />
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<meta name="description" content="Oyun indir, Oyun Download, Full Oyun indir, Full Oyun Download, Oyun Yama , Oyun Hile, Tek link Oyun indir,Sorunsuz Download,No rapid indir" />
<meta name="keywords" content="Oyun indir, Oyun Download, Full Oyun indir, Full Oyun Download, Oyun Yama , Oyun Hilesi, No CD DVD Crack , Sorunsuz Oyun indir,Tek link indir,oyun indirme,oyun hileleri,no rapid" />
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</head>yani index.php de get_header fonksiyonu 2 defa kullanılmış olabilir