After applying some branding to my SharePoint site (SharePoint 2010), I have noticed that the _layouts/spcf.aspx page does not seem to have to correct styling applied. After further examination it seems that the html for this page is incorrect, it has 2<head> tags with content. What is the deal with this file, does your _layouts/spcf.aspx file also have 2 head tags?
I've noticed there are more SharePoint application pages that have this problem, but I can't seem to find anything about it. Surely I'm not the first to notice this.