Same issue here, on a development server.
# ls -la
drwxr-xr-x 5 root root 4096 2011-01-23 00:14 .
drwxr-xr-x 7 root root 4096 2011-02-03 10:11 ..
drwxr-xr-x 9 6226 6226 4096 2010-12-15 14:17 d
drwxr-xr-x 8 root root 4096 2011-01-23 13:51 htdocs
"d" is a drupal installation, and the directory was created with:
# tar -xzvf drupal.tar.gz
Using tar to directly examine its archive:
# gunzip drupal.tar.gz
# tar -tvf drupal.tar
-rw-r--r-- bender/bender 765 2007-09-10 13:29 drupal-6.20/themes/pushbutton/forum-link-rtl.png
Only one line is included because they all show the same owner/group. A quick Google search shows a few similar cases. Mystery solved?