Hi Default postgresql port is 5432. If you try to install two different postgresql versions on Debian, it assigns the next port to the new database. I guest you have (at least at 8.4 install time) postgresql 8.3 installed too.
I think it's not a bug (default port is ok) and you can always use the --port parameter. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org