Do you have any idea what might cause it?
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<?php if ( is_single() ) { ?><?php wp_title(''); ?><?php } ?>
<?php if ( is_category() ) { ?><?php single_cat_title(); ?>Cases and Covers for <?php } ?>
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<?php if ( is_search() ) { ?><?php bloginfo('name'); ?> | Search Results<?php } ?>
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<meta name="description" content="<?php bloginfo('description'); ?>" />
<meta name="keywords" content="some,website,keywords" /><?php endif; ?>
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