my ssl pages will not validate w3c

if you go to ttps:/www.purelypoultry.com and go to the footer and click on the w3c logo, it does not validate, but without the https://

and using just http:// it works fine, i get this error:

Sorry! This document can not be checked.
No Referer header found!

You have requested we check the referring page, but your browser did not send the HTTP "Referer" header field. This can be for several reasons, but most commonly it is because your browser does not know about this header, has been configured not to send one, transferred the referring document over a secure protocol such as https but is accessing the validator over ordinary non-secure http, or is behind a proxy or firewall that strips it out of the request before it reaches us.
This is not an error in the referring page!
Please use the form interface on the Validator Home Page to check the page by URL.

how do i fix this?

When I go directly to the validator and enter your address, both http and https validate.

Just my $.02 worth, but your customers couldn't care less whether your site validates or not. Most don't even know what that means. I think that logo is a waste of space.

thank you, i read somewhere on hear that it help show you are trustworthy, most people hopping for poultry wouldnt know what that was, your right, but shouldnt i leave it there?