wp-commentsrss2.php show the same permalink

I’m using wordpress beta since migration from other software last year, now I also migrate to WP 1.5

My problem is any comments feed got the same permalink, you can see directly to my blog
http://yulian.firdaus.or.id/wp-commentsrss2.php or
http://yulian.firdaus.or.id/comments/feed/

Any incoming comments will be feed as the same as the last permalink posts

I don’t know where to hack since I don’t really a PHP programmer

Any comment and help will be appreciated.
Thanks.