Hey SueAnn, Sure I think I can help you here.
DotNetNuke is trying to be clever and includes a return parameter on their login URLs. So on the homepage the login link is http://www.faisongroup.com/Login/tabid/750/Default.aspx?returnurl=%2FLogin%2Ftabid%2F750%2FDefault.aspx
Meaning that once you've logged in, asp.net will redirect you back to Default.aspx (the homepage).
Now, when you click on the about page, the login link changes to http://www.faisongroup.com/Login/tabid/750/Default.aspx?returnurl=%2FAbout.aspx, notice the return URL is now About.aspx.
So in short, the answer is to add returnurl to your list of parameters to ignore in webmaster tools.
I would also suggest adding deny /login/* to your robots.txt file as you don't really want these login URLs indexed anyway.
Hope this helps,
Goodluck,
Woody 
