CQWP - displaying Author, Check Out To, etc... from multiple libraries

I have a CQWP which lists the document icon, Title, Author, Checked Out To, and Last Modified. Everything displays fine if I point it at a single document library but when I point it to the subsite, in order to see documents from all libraries, I get the icon and title but nothing else. What am I missing? I am just using <xsl:value-of select="@Author" /> to output the Author's name.