Why is my log-in form appearing when visiting my subdomain?

// COOKIE CODE
 
			session_start();
			include('includes.php');
			include('db_connect.php');
			
			// username and password sent from form
			$myusername=$_POST['myusername'];
			$mypassword=$_POST['mypassword'];
			
			// To protect MySQL injection (more detail about MySQL injection)
			$myusername = stripslashes($myusername);
			$mypassword = stripslashes($mypassword);
			$myusername = mysql_real_escape_string($myusername);
			$mypassword = mysql_real_escape_string($mypassword);
			
			$sql="SELECT * FROM members WHERE username='$myusername' AND password='$mypassword' LIMIT 1";
			
			// ALWAYS TEST FOR QUERY SUCCESS!                        
			if (!$result=mysql_query($sql)) die( mysql_error() );
 
			// Mysql_num_row is counting table row
			$count=mysql_num_rows($result);
			// If result matched $myusername and $mypassword, table row must be 1 row
 
			// IF NO RECORD FOUND, NOT LOGGED IN			
			if($count!=1)
			{
			   die("No match for User Id and Password");
			}
 
			// IF WE GET THIS FAR WE CAN COMPLETE THE LOGIN
			
			// PUT USERNAME IN SESSION
			$_SESSION["myusername"] = $myusername;
			$_SESSION["mypassword"] = $myusername;
			 
			// REMEMBER ME?
			if ($_POST["rememberme"] != '') // CLIENT CHECKED "REMEMBER ME"
			{
			// SET A COOKIE TO REMEMBER THE LOGIN 
			   $cookie_value	= "$myusername";
			   $cookie_name 	= "myusername";
			   $cookie_life	= time() + 6*60*60; // SIX HOURS - CHECK THIS VALUE CAREFULLY
			   if (!setcookie($cookie_name, $cookie_value, $cookie_expires,'/', ".evibesmusic.com"))  { /* echo "Cookie Failed"; */ }
			}
			
			$directoryname = end( explode( '/', dirname ( $_SERVER['PHP_SELF'] ) ) );
			$directory = "http://www.evibesmusic.com/members/$directoryname";
			$dir = "http://www.evibesmusic.com/members/include/";
			// Open a known directory, and proceed to read its contents
			if (is_dir($dir)) {
				if ($dh = opendir($dir)) {
					while (($file = readdir($dh)) !== false) {
						if (is_dir($dir . '/' . $file)) {
							continue;
						}
						copy($dir . '/' . $file, $directory . '/' . $file);
					}
					closedir($dh);
				}
			}
			 
			// REDIRECT TO THE MEMBERS UPDATE PAGE
			header("Location: members/update.php");
			exit;
			 
			//END PROCESSING SCRIPT
 
//END COOKIE CODE
 
// FORM CODE
 
// ALWAYS ALWAYS ALWAYS START THE SESSION ON EVERY PAGE NO EXCEPTIONS
session_start();
 
//  if(!session_is_registered(myusername)){ NO - JUST REFER TO THE VARIABLES
 
// IF SESSION USER NAME IS EMPTY, 
if($_SESSION["myusername"] == '')
{ 
    echo 	"
<div style='border-top:1px solid #FFFFFF; color:#FFFFFF;'>
  <form name='login' method='post' action='$checklogin' style='margin-top:0px;'>
	<a href='http://www.evibesmusic.com/members/forgot-password.php' style='color:#FFFFFF;'>Forget your password?</a> || <a href='$signup' style='color:#FFFFFF;'>Join Today</a>
	<table width='auto' border='0' cellpadding='0' cellspacing='0' style='margin-top:4px; margin-bottom:0px;'>
	<tr>
	<td><label for='label'>username</label>
	: </td>
	<td><input type='text' name='myusername' value='' id='myusername' style='width:120px; height:10px; margin-left:5px;'/></td>
	<td rowspan='2'><div id='login-button'>
	  <input type='image' src='http://www.evibesmusic.com/images/btn_login.gif' name='l' value='h' id='l' />
	  </div></td>
	</tr>
	<tr>
	<td><label for='label'>password</label>
	: </td>
	<td><input type='password' name='mypassword' value='' id='mypassword' style='width:120px; height:10px; margin-left:5px;' /></td>
	</tr>
	<tr>
	<td>&nbsp;</td>
	<td><label>
	  <input type='checkbox' name='rememberme' id='rememberme' style='height:10px;' />
	  remember me</label></td>
	<td>&nbsp;</td>
	</tr>
	</table>
  </form>
	</div>
		"; 
} 
 
// IF SESSION USER NAME IS NOT EMPTY, 
if($_SESSION["myusername"] != ''){
$sql="SELECT * FROM members WHERE username='$myusername'";
$result=mysql_query($sql);
while ($getinfo = mysql_fetch_array($result)){
 
echo 	"
		<div style='border-top:1px solid #FFFFFF; color:#FFFFFF;'>
		<br />
		<b>Welcome ".$getinfo['username']."</b>
		<br><br>
		<b><a href='http://my.evibesmusic.com/".$getinfo['username']."' style='color:#FFF000;'>View</a> your profile || <a href='members/update.php' style='color:#FFF000;'>Edit</a> your profile</b>
		<br><br>
		<b><a href='$yourvideos' style='color:#FFF000;'>Your Flix</a> || <a href='$yourpics' style='color:#FFF000;'>Your Pics</a> || <a href='$logout' style='color:#FFF000;'>Log-Out</a></b>
		</div>
		"; 
		}
	}
 
// END FORM CODE