Wanted To Make A Custom Domain Seach Script In My Domain

I am trying to make ip tracking system for my web and then inserting it into the sql.

But my problem is that on a single click i am getting 2-4ip in my sql.

Coding am using this currently.

<?php
include 'config.php';
$ip=$_SERVER['REMOTE_ADDR'];
$referer=$_SERVER['HTTP_REFERER'];
 mysql_query("INSERT INTO `track`(`date`, `time`, `ip`, `referer`)       
VALUES ( CURDATE(), NOW(),'".$ip."', '".$referer."')");
echo"<script type='text/javascript'>
 window.'http://example.com';
 </script>";
?>

When anyone click on this it is saving around 4ips that too different and even sometimes of different countries.

Why this problem is arising in my tracking system.