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according to HTTP 1.1 protocol http://www.w3.org/Protocols/rfc2616/rfc2616-sec15.html#sec15.1.3 Clients SHOULD NOT include a Referer header field in a (non-secure) HTTP request if the referring page was transferred with a secure
This is almost certainly due to an incorrect link to your site from somewhere else. Most forum software has bad auto-link detection so if someone posts a URL at the end of a sentence and finishes the sentence with a period, it will include the period in the URL link. The same thing often happens with URLs in parentheses. In general there isn't anything you ...
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