category_count problem

Hi friends,
i’m having problems with this function
on category.php

I’m trying to show the post count using this code:

$cat = get_the_category(); $cat = $cat[0];
echo $cat->category_count;

The problem is:
When I access the category page like “category/category-name” the count is incorrect, but when i go to the page 2 or more like: “category/category-name/page/2” it’s right.

Some one had this issue and could help me please?

Thank you