Facebook URL when auto posting

When auto posting to Facebook, the URL to the blog is /my-blog-dashboard/entry/myblog.html, but when viewing the blog from the front page, the URL is blog/entry/myblog.html. What happens in this case is when the visitors are redirected from the Facebook post to the blog (the first URL), and FB like the page, it gets counted for that page. But if someone naturally discovers and reads the blog from my site (the second URL), none of the FB likes are accounted for because of the different URL path. Is there a reason why the Facebook posts don't use the same URL as from the front page?

Thanks
Jereme