Wordpress: why is the init hook invoked multiple times?

Question

I am at a real loss at this problem. I just created a plug-in, and to log the actions in the plug-in (as I can\'t see the output of the processing), I added a hook to init l

Answer 1

After Rob Williams' answer I've read this post:

http://www.tastyplacement.com/how-to-remove-link-relprev-and-link-relnext-from-wordpress-head

And realized that the link tags with rel="next" and rel="prev" was running my init hook for a second time on my WordPress 3.5.1 website. These tags can be removed adding this to the theme functions.php file:

remove_filter('wp_head','adjacent_posts_rel_link_wp_head',10);