Dont know if this has been mentioned and i dont even know what to call the error, but this need fixing in orca, i guess it could be called bleeding from one post to the other.

see it here

http://www.boonex.com/unity/forums/#topic/Install-Permissions-problem-2009-05-11.htm

It doesnt do it all the time though, just sometimes where each post will bleed onto the next