Why this counting posts system doesn’t work ?

Hi guys,

I’d like to list, in a fancy way and outside the loop, some categories and how many posts they include.

For instance, I’ve found this useful info.

But, why this other code isn’t working for me ?

<?php

	$cat_posts = get_posts('category_name=BLAH');

	echo
		'<h5 class="italic">There are '
		. count($cat_posts) .
		' Posts in <a href="http://url.com/blog/category/blah/">BLAH CATEGORY</a></h5>';

?>

For some cats is working, for other it shows me less than there are.