PHP - Not Submiting The Info

public function EchoLimitSelector()
    {
        $limit = isset($_GET['limit']) ? $_GET['limit'] : NULL;

        echo "<div class='tright'>";
        echo "<form action='?page=EditPost&limit=".$limit."' method='GET'>";
        echo "<span>Posts per page: </span>";
        echo "<select name='limit' style='font-size: 16px; width: 50px;' onchange='this.form.submit();'>";

        for($x = 5; $x <= 10; $x++)
        {
            echo "<option value=".$x. " ";

            //Setting default selected value
            if($limit)
            {
                if($limit == $x)
                {
                    echo "selected";
                }
            }
            else
            {
                if($x == 5)
                {
                    echo "selected";
                }
            }

            echo ">".$x."</option>";
        }

        echo "</select>";
        echo "<noscript><input type='submit' value='Go' style='height: 26px; padding: 0; margin-top: -7px;'/></noscript>";
        echo "</form>";
        echo "</div>";
    }

// postavi ili povecaj broj u sessiji ako je Login button aktiviran
if (empty($_SESSION['failed_login'])) 
{
    $_SESSION['failed_login'] = 1;
} 
elseif (isset($_POST['login'])) 
{
    $_SESSION['failed_login']++;
}

// if login fail 3 times
if ($_SESSION['failed_login'] > 3) {
	$error[] = 'U failed to login 3 times ' . $_SESSION['failed_login'];
} 

<?php

// protect page from direct access
if (!defined('AUTH')) { die('You are not authorized to see this page !'); }

if ($general->is_logged() === true)
{
	header('Location: index.php');
	exit();
}

$last_login_date = time();
$ip = $general->get_ip();

// postavi ili povecaj broj u sessiji ako je Login button aktiviran
if (empty($_SESSION['failed_login'])) 
{
    $_SESSION['failed_login'] = 1;
} 
elseif (isset($_POST['login'])) 
{
    $_SESSION['failed_login']++;
}

// if login fail 3 times
if ($_SESSION['failed_login'] > 3) {
	$error[] = 'U failed to login 3 times ' . $_SESSION['failed_login'];
}

// login form
if (isset($_POST['login']))
{
	$username = trim($_POST['username']);
	$password = trim($general->safepass($_POST['password']));

	// if user entered username and password
	if (empty($username) || empty($password))
	{
		$error[] = 'Please enter username and password';
	}
	else
	{
		// login query
		$login = $users->login($username, $password);

		// cookie login
		if (isset($_POST['stay_logged']))
		{
			// check if username and password is valid 
			if ($login) 
			{
				$user_id = $login['id'];

				// expire time for cookie 1 month
				$expire = time()+60*60*24*30;

				// make random code for token
				$rand = hash('sha512', mt_rand());

				// set cookies
				setcookie('token', $rand, $expire);
				setcookie('username', $login['username'], $expire);
				setcookie('id', $login['id'], $expire);

				// update user last_login, ip, token code
				$update_login_data = $users->update_cookie_login($last_login_date, $ip, $rand, $user_id);

				// redirect user to index.php and exit script
				header('Location: index.php');
				exit();
			}
			else
			{
				// if username or password is not valid
				$error[] = 'Invalid username or password';
			}
		}

		// session login
		else
		{
			// check if username and password is valid
			if ($login) 
			{
				// make sessions with user_id and username
				$_SESSION['id'] = $login['id'];
				$_SESSION['username'] = $login['username'];
				$user_id = (int)$_SESSION['id'];

				// update user last_login, ip
				$update_login = $users->update_user_ip_login($last_login_date, $ip, $user_id);

				// redirect user to index.php and exit script
				header('Location: index.php');
				exit();
			}
			else
			{
				// if username or password is not valid
				$error[] = 'Invalid username or password';
			}
		}
	}
}

?>

<h3>Log in</h3>

<?php
if (!empty($error)) {
	echo '<div class="big-error-msg"><ul style="margin:0 0 0 20px;">';
	foreach ($error as $error) {
		echo '<li>'.$error. '</li>';
	}
	echo '</ul></div>';
}
?>

<form action="" method="POST" class="login-form">
	<input type="text" name="username" placeholder="Username" required>&nbsp;&nbsp;&nbsp;
	<input type="password" name="password" placeholder="Password" required><br><br>
	<input type="checkbox" name="stay_logged"><label style="padding:0 0 0 10px;">Remember me ?</label><br>
	<input type="submit" name="login" value="Log in" class="small-button">
	<label>
		<p><a href="index.php?page=forgotten_pass" title="Forgotten password ?">Forgotten password ?</a></p>
		<p>Don't have an account ? <a href="index.php?page=register" title="Register">Register</a></p>
	</label>
</form>