how to avoid double display?

[Lionel]

I am implementing a playlist system based on the downloads II hack. People click on an add or remove icon and song is added to playlist and play as a jukebox. It works fine, except that in songlist it displays double. Can someone please tell me how to correct the below query? I also tried to make it DISTINCT

PHP Code:

  $result = $db->query_read("SELECT dl.*, play.userid as userid FROM " . TABLE_PREFIX . "dl_files 
as dl
LEFT JOIN " . TABLE_PREFIX . "playlist as play on (dl.url=play.fileurl)
WHERE `purgatory` = '0' AND `category` = ".$db->sql_prepare($cleancatid)." ORDER BY userid DESC, `pin` DESC, 
`".$sortfield."` DESC LIMIT ".$db->sql_prepare($limit).",".$dl->perpage);
 }
 $uid=$vbulletin->userinfo['userid'];
 if ($db->num_rows($result) > 0)
 {
  while ($file = $db->fetch_array($result))
  {
   $song=$file['url'];
   $date = vbdate($vbulletin->options['dateformat'], $file['date'], true);
   $downloads = vb_number_format($file['downloads']);
   if ($file['userid'] == $uid){
   $fimage="<a href=\"playlist.php?do=removesong&song=$song\"><img border=\"0\" 
alt=\"remove from playlist\" src=\"/forums/images/misc/sound_delete.png\"></a>";
   }else {
   $fimage="<a href=\"playlist.php?do=addsong&song=$song\"><img border=\"0\" alt=\"add to 
playlist\" src=\"/forums/images/misc/sound_add.png\"></a>";