what is the miracle for that

The plugin

http://wordpress.org/extend/plugins/humanized-statistics/

The code added to line ~260 in http://plugins.svn.wordpress.org/humanized-statistics/tags/0.3/google-chart-statistics.php

//Total visit known users
				$count = 0;
				$count = get_post_meta($id, 'gcs_total_known', true);

				$up = $count + $mule;
				update_post_meta($id, 'gcs_total_known', $up);

				var_dump($count);
				var_dump('+');
				var_dump($mule);
				var_dump('=');
				var_dump($up);
				var_dump('or =');
				var_dump(get_post_meta($id, 'gcs_total_known', true));

The counter increase by x2 and drive me crazy and when I add a #comment on the update_post_meta the counter stop normally.

is the same for my plugin with another filter/hook on the_content http://wordpress.org/extend/plugins/kw-modern-advertise/

the filter/hook on “the_content” is covered for the exact number of articles in the loop if “is_category” is in-use in the hook/filter on the_content and if a user is in the frontend loop for one specific category.

There is a WordPress theory/codex information that I spent ?