[WetWired]

Well, your first problem is that you destroy all the data before you try to display it.
Try replacing

$top_rep = $DB_site->query("SELECT * FROM ".TABLE_PREFIX."user ORDER BY reputation DESC LIMIT 10"); 
while($top_rep = $DB_site->fetch_array($top_rep)) 
unset($top_rep); 
$DB_site->free_result($top_rep); 

eval('$top_stats[\'top_rep\'] .= "' . fetch_template('toprep') . '";');

with

$top_rep_res = $DB_site->query("SELECT * FROM ".TABLE_PREFIX."user ORDER BY reputation DESC LIMIT 10"); 
while($top_rep = $DB_site->fetch_array($top_rep_res))
  eval('$top_stats[\'top_rep\'] .= "' . fetch_template('toprep') . '";'); 
$DB_site->free_result($top_rep_res);