Registration form with ajax on Wordpress

Question

I am trying to create a registration form with ajax on wordpress. It works without problems. Member can register. However, for example, when I set the password as "123", it gives an error when trying to login with the same membership. Password incorrect error. Where do you think I am doing wrong? I'm not an expert on this. Thanks.

theme.js ;

$('.register-form').on('submit', function(e){
    e.preventDefault();

    let form = $(this),
    submit_button = form.find('button[type="submit"]');

    $.ajax({
        type: 'POST',
        url: yaygin_object.ajax_url,
        data: form.serialize() + '&action=yaygin_do_register_form',
        dataType: 'json',
        beforeSend: function() {
            submit_button.attr('disabled', true);
            form.find('.alert').remove();
        },
        success: function (response) {
            if(response.success) {
                form.prepend('<div class="alert alert-success" role="alert">' + response.data.message + '</div>');

                setTimeout( function() {
                    window.location.href = yaygin_object.home_url;
                }, 1000 );
                
            } else {
                form.prepend('<div class="alert alert-danger" role="alert">' + response.data.message + '</div>');
            }
        },
        complete: function() {
            submit_button.attr('disabled', false);
        }
    });
});

register.php

<form class="register-form ortala" method="post">
    <input type="name" id="name" class="form-control form-control-sm mb-2" name="name" placeholder="<?php esc_attr_e('User Name', 'yaygin'); ?>" required>
    <input type="email" id="email" class="form-control form-control-sm mb-2" name="email" placeholder="<?php esc_attr_e('E-Mail', 'yaygin'); ?>" required>
    <input type="password" id="password" class="form-control form-control-sm mb-2" name="password" placeholder="<?php esc_attr_e('Password', 'yaygin'); ?>" required>
    <button type="submit" class="btn btn-dark btn-sm"><i class="fa fa-user-plus"></i> <?php esc_html_e('Sign up', 'yaygin'); ?></button>
    <?php wp_nonce_field('register_action', 'register_field'); ?>
</form>

ajax-functions.php

function yaygin_do_register_form() {
check_ajax_referer('register_action', 'register_field');

$name = sanitize_text_field( $_POST['name'] );
$email = sanitize_email( $_POST['email'] );
$password = sanitize_text_field( $_POST['password'] );

$creds = array(
    'user_login'    => $name,
    'user_password' => $password,
    'user_email'    => $email,
);

$user = wp_insert_user( $creds, is_ssl() ); 

if (is_wp_error( $user )) {
    wp_send_json_error( array('message' => $user->get_error_message() ) );
}

wp_send_json_success( array('message' => esc_html__('Registration Successful. Please wait...', 'yaygin') ) );}add_action('wp_ajax_nopriv_yaygin_do_register_form', 'yaygin_do_register_form');