The template outputs the tag with the "name" attribute rather than the "http-equiv" character, this can cause certain characters to be displayed incorrectly.

{foreach $site.http_equiv as $key => $item}
<meta name="{$key|wash}" content="{$item|wash}" />

Should be:

{foreach $site.http_equiv as $key => $item}

<meta http-equiv="{$key|wash}" content="{$item|wash}" />