Not working in maintenance mode?

I tested this plugin on a 503.php template for a coming soon page, before the maintenance mode and it worked perfectly.

After we turned on the maintenance mode (using WooDojo plugin) it doesn’t display the email input and the submit button. Instead is showing the hidden inputs and: <input type=”text” name=”_mc4wp_required_but_not_really” value=””>

The page is basically using the exact same code.

I’m using this code outside of loop:
<?php

if( function_exists( ‘mc4wp_form’ ) ) {
mc4wp_form();
}
?>

Any ideas?

https://wordpress.org/plugins/mailchimp-for-wp/