A data field is not inesrting into database table from custom registration form

My registration form working fine. All data inserting into database table but "About/Bio" field not inserting into database table. Please help me out

<?php 

function registration_form( $username, $password, $email, $website, $bio ) {
echo '
<style>

div {
    margin-bottom:2px;
}

input{
    margin-bottom:4px;
}

</style>
';

echo '
<form action="' . $_SERVER['REQUEST_URI'] . '" method="post">
<div>
<label for="username">Username <strong>*</strong></label>
<input type="text" name="username" value="' . ( isset( $_POST['username'] ) ? $username : null ) . '">
</div>

<div>
<label for="password">Password <strong>*</strong></label>
<input type="password" name="password" value="' . ( isset( $_POST['password'] ) ? $password : null ) . '">
</div>

<div>
<label for="email">Email <strong>*</strong></label>
<input type="text" name="email" value="' . ( isset( $_POST['email']) ? $email : null ) . '">
</div>
<div>
<label for="email">Email <strong>*</strong></label>
<input type="text" name="confirm_email" value="' . ( isset( $_POST['confirm_email']) ? $confirm_email : null ) . '">
</div>

<div>
<label for="website">Website</label>
<input type="text" name="website" value="' . ( isset( $_POST['website']) ? $website : null ) . '">
</div>


</div>

<div>
<label for="bio">About / Bio</label>
<textarea name="bio">' . ( isset( $_POST['description']) ? $bio : null ) . '</textarea>
</div>
<input type="submit" name="submit" value="Register"/>
</form>


    ';
}

function registration_validation( $username, $password, $confirm_email, $email, $website, $bio )  {
global $reg_errors;
$reg_errors = new WP_Error;

if ( empty( $username ) || empty( $password ) || empty( $email ) ) {
    $reg_errors->add('field', 'Required form field is missing');
}

if ( 4 > strlen( $username ) ) {
    $reg_errors->add( 'username_length', 'Username too short. At least 4 characters is required' );
}
if ( username_exists( $username ) ){
    $reg_errors->add('user_name', 'Sorry, that username already exists!');
}
if ( ! validate_username( $username ) ) {
    $reg_errors->add( 'username_invalid', 'Sorry, the username you entered is not valid' );
}
if ( 5 > strlen( $password ) ) {
    $reg_errors->add( 'password', 'Password length must be greater than 5' );
}
if ( !is_email( $email ) ) {
    $reg_errors->add( 'email_invalid', 'Email is not valid' );
}
if ( $_POST['email'] !== $_POST['confirm_email'] ) {
    $reg_errors->add( 'email_not_matched', "<strong>ERROR</strong>: E-mail is not match" );
    } 
if ( ! empty( $website ) ) {
    if ( ! filter_var( $website, FILTER_VALIDATE_URL ) ) {
        $reg_errors->add( 'website', 'Website is not a valid URL' );
    }
}
if ( is_wp_error( $reg_errors ) ) {

    foreach ( $reg_errors->get_error_messages() as $error ) {

        echo '<div>';
        echo '<strong>ERROR</strong>:';
        echo $error . '<br/>';
        echo '</div>';

        }

        }
    }

    function complete_registration() {
    global $reg_errors, $username, $password, $email, $website, $bio;
    if ( 1 > count( $reg_errors->get_error_messages() ) ) {
    $userdata = array(
    'user_login'    =>   $username,
    'user_email'    =>   $email,
    'user_pass'     =>   $password,
    'user_url'      =>   $website,
    'description'   =>   $bio
    );
    $user = wp_insert_user( $userdata );
    echo 'Registration complete. Goto <a href="' . get_site_url() . '/wp-login.php">login page</a>.';   
    }
    }

    function custom_registration_function() {
        if ( isset($_POST['submit'] ) ) {
    registration_validation(
    $_POST['username'],
    $_POST['password'],
    $_POST['email'],
    $_POST['confirm_email'],
    $_POST['website'],
    $_POST['description']
    );

    // sanitize user form input
    global $username, $password, $email, $website, $bio;
    $username   =   sanitize_user( $_POST['username'] );
    $password   =   esc_attr( $_POST['password'] );
    $email      =   sanitize_email( $_POST['email'] );
    $website    =   esc_url( $_POST['website'] );
    $bio        =   esc_textarea( $_POST['description'] );

    // call @function complete_registration to create the user
    // only when no WP_error is found
    complete_registration(
    $username,
    $password,
    $email,
    $website,
    $bio
    );
    }

    registration_form(
    $username,
    $password,
    $email,
    $website,
    $bio
    );
    }

    // Register a new shortcode: [cr_custom_registration]
    add_shortcode( 'cr_custom_registration', 'custom_registration_shortcode' );

    // The callback function that will replace [book]
    function custom_registration_shortcode() {
    ob_start();
    custom_registration_function();
    return ob_get_clean();
            }

        ?>