Why the Home link on sidebar does not point to the homepage URL?
The "Home" link on the sidebar points to the Blog Address URL. The Blog Address URL is based on the value you’ve set in WP Admin \ Options \ General \ Blog Address URL.
In most of the cases, a WordPress blog has a URL in the form http://www.site.com and the "Home" link on the sidebar points to the URL of the "Homepage" http://www.site.com.
In some cases, people have their regular site URL under http://www.site.com and their WordPress Blog URL under http://www.site.com/blog. In such case, the "Home" link on the sidebar points to the URL http://www.site.com/blog and not the URL of the "Homepage", which may confuse come people.
Depending on user request, we may add the possibility to customize the label and URL of the "Home" link on the sidebar.