Stories are split by the sidebar

Hi!
Steps at 3 May 2010:
Download & Install Drupal 6.16: http://ftp.drupal.org/files/projects/drupal-6.16.tar.gz
Install Ubuntu Theme 2010: http://drupal.org/project/udtheme-2010 (I just try with the development version too, and equal result).
Install Ubuntu Sidebar: http://drupal.org/project/udsidebar
Add Theme and Sidebar in Drupal (Sidebar at left).
Create 2 Stories in Drupal.
Go to main web > BUG: Main web split the stories:
- One story in top main (correct).
- Next stories bottom the Sidebar (or any component: search bar, countdown...).

I attach a screenshot where you can see the bug ;)

Best regards!