Some time shortcodes add some some extra <p> and <br /> after of before post.This is happend because of the wpautop filter.
You can easily prevent this by changing the execution priority of wpautop filter.
Simply use this code on your theme functions.php
remove_filter( ‘the_content’, ‘wpautop’ );
add_filter( ‘the_content’, ‘wpautop’ , 12);[/php]