Wordpress/woocommerce redirect after registration - ajax

Question

I have a custom registration page on my Woocommerce site created by a developer who has gone awol.
Once you have registered on the website it redirects you to:
http://www.punjaban.co.uk/wp-admin/admin-ajax.php?action=load_lightbox&lightboxTemplate=register
which is wrong and only displays the my-account page but with no formatting.
I tried adding:
function punjaban_registration_redirect() {
return home_url;
}
add_filter( 'registration_redirect', 'punjaban_registration_redirect' );
but that has not worked. Can anyone point me in the right direction please.
The custom register.php code is:
<?php global $myaccount_page_url; ?>
<h1><?php _e( 'Create an account', 'woocommerce' ); ?></h1>
<form method="post" class="register account-form" action="<?php echo $myaccount_page_url; ?>?action=register">
<?php do_action( 'woocommerce_register_form_start' ); ?>
<div class="row">
<div class="column xsmall-12 small-6">
<input type="text" name="billing_first_name" id="reg_billing_first_name" placeholder="<?php esc_attr_e( 'FIRST NAME', 'punjaban' ); ?>" value="<?php if ( ! empty( $_POST['billing_first_name'] ) ) esc_attr_e( $_POST['billing_first_name'] ); ?>" />
</div>
<div class="column xsmall-12 small-6">
<input type="text" name="billing_last_name" id="reg_billing_last_name" placeholder="<?php esc_attr_e( 'LAST NAME', 'punjaban' ); ?>" value="<?php if ( ! empty( $_POST['billing_last_name'] ) ) esc_attr_e( $_POST['billing_last_name'] ); ?>" />
</div>
<?php if ( 'no' === get_option( 'woocommerce_registration_generate_username' ) ) : ?>
<div class="column xsmall-12">
<label for="reg_username"><?php _e( 'Username', 'woocommerce' ); ?> <span class="required">*</span></label>
<input type="text" class="woocommerce-Input woocommerce-Input--text input-text" name="username" id="reg_username" placeholder="<?php esc_attr_e( 'USERNAME', 'punjaban' ); ?>" value="<?php if ( ! empty( $_POST['username'] ) ) echo esc_attr( $_POST['username'] ); ?>" />
</div>
<?php endif; ?>
<div class="column xsmall-12">
<label for="reg_email"><?php _e( 'Email address', 'woocommerce' ); ?> <span class="required">*</span></label>
<input type="email" class="woocommerce-Input woocommerce-Input--text input-text" name="email" id="reg_email" placeholder="<?php esc_attr_e( 'EMAIL ADDRESS', 'punjaban' ); ?>" value="<?php if ( ! empty( $_POST['email'] ) ) echo esc_attr( $_POST['email'] ); ?>" />
</div>
<?php if ( 'no' === get_option( 'woocommerce_registration_generate_password' ) ) : ?>
<div class="column xsmall-12">
<input type="password" name="password" id="reg_password" placeholder="<?php esc_attr_e( 'PASSWORD', 'punjaban' ); ?>" />
</div>
<?php endif; ?>
<!-- Spam Trap -->
<div style="left: -999em; position: absolute;"><label for="trap"><?php _e( 'Anti-spam', 'woocommerce' ); ?></label>
<input type="text" name="email_2" id="trap" tabindex="-1" /></div>
<div class="column xsmall-12">
<input type="password" name="password2" id="reg_password2" placeholder="<?php esc_attr_e( 'CONFIRM PASSWORD', 'punjaban' ); ?>" />
</div>
<div class="column xsmall-12">
<div class="custom-checkbox">
<input name="newsletter" type="checkbox" id="newsletter" value="1" checked="checked" />
<label for="newsletter"><span class="icon"></span> <?php _e('Keep me posted with new recipes and news','punjaban'); ?></label>
</div>
</div>
<?php do_action( 'woocommerce_register_form' ); ?>
<?php do_action( 'register_form' ); ?>
<div class="column xsmall-12">
<?php wp_nonce_field( 'woocommerce-register' ); ?>
<input type="submit" class="btn form-btn" name="register" value="<?php _e( 'CREATE ACCOUNT', 'punjaban' ); ?>" />
</div>
</div>
<?php do_action( 'woocommerce_register_form_end' ); ?>
</form>
<div class="login-switch">
<h2>Already have an account?</h2>
<?php _e( 'LOGIN', 'woocommerce' ); ?>
</div>
Thanks in advance.

Answer 1

You are probably returning wrong value.
You should return homer_url(); function.
--EDIT
Also you could try "woocommerce_registration_redirect" filter instead of "registration_redirect"