Shortcode showing at top of post

I have created numerous custom short-codes for my new website and they work fine. Only problem is when I insert them into page content they go straight to the top of the post -rather than the exact point i pasted the code. ANy ideas why?

<?php function video_shortcode( $atts )
{
extract(shortcode_atts(array(
        'title' => '',
		'url' => '',
	), $atts));
		echo '<div class="video-hug v-page relative dumb"><div class="title dumber"><h1 class="h1">' . $title . '</h1></div><a class="video-link" href="' . $url . '"></a></div>   ';
}
add_shortcode('video', 'video_shortcode'); ?><?php
function displayLatestTweet($twitterID){
     include_once(ABSPATH.WPINC.'/rss.php');
     $latest_tweet = fetch_rss("https://search.twitter.com/search.atom?q=from:" . $twitterID . "&rpp=1");
     echo $latest_tweet->items[0]['atom_content'];
}
?>