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I think the code validator is wrong. If part of a URL is missing then the other parts are filled in from the parent page. So for example, if an image is referred to from http://example.org/page1.html with src="pic.jpg" then the browser adds http://example.org/ before the src.jpg before it fetches the file. If the http: part of the url (the protocol) is ...

Problem is in how GA counts Visits and how it counts Visitors. That's quite messy thing so better I'd redirect you to some of the detailed descriptions online: Google support - Visits vs. Visitors Unique visits and visitors GA Mystery of visitors :)