update_post_meta adds one to value

In the code below, I pull the page view counter from postmeta and increment it by one.

When I update via update_post_meta, the counter value that goes into the database is incremented mysteriously by 1 again. So, if the counter was at 3, after the update it will be set to 5.

If, however, I update the record directly via mysql_query, the counter value in the database is set to what I calculated, that is 1+the old counter, not 2+the old counter.

I would prefer to use update_post_meta. But why is it doing this?
Here is my code with my debugging statements. You can see the two different ways I try to update the database down in the last few lines of code. One way is commented out, because I was testing.

function setPostViews($postID) {
    $count_key = 'Views';
	$count=0;
    $count = get_post_meta($postID, $count_key, true);
	var_dump($count);
	echo "count " . $count . "<br>";
	if($count==''){
	    $count = 1;
        delete_post_meta($postID, $count_key);
        add_post_meta($postID, $count_key, '1');
    }else{
		 $count++;
        // update_post_meta($postID, $count_key, $count);
		$query="update hoparticlespostmeta  set meta_value='".$count."' where meta_key='Views' and post_id=".$postID;
		mysql_query($query);
    }
}