admin-post.php issue form submission

I have a form on a WordPress site that also adds a record to mysql database.

The issue is that the form does not go to where it is suppose to: https://wordpresssite/get-form/

If if submit the form as administrator the form works. Submitting the form as a subscriber does not work. It just redirects to the subscribers home page.

Here is the form code:

<?php if(isset($_GET['success'])): 
echo "<script>window.location='https://website/get-form/'</script>";?>
<?php endif; ?>

<?php if(isset($_GET['error'])): ?>
    <div class="alert alert-danger">
        <h3>Sorry! Unable to submit the form.</h3>
    </div>
<?php endif; ?>

<form name="order_form" method="POST" action="<?php echo esc_url( admin_url('admin-post.php') ); ?>" enctype="multipart/form-data" autocomplete="off" accept-charset="utf-8">
<?php if(isset($_GET['success'])): 
    echo "<script>window.location='https://smilepix.com/sp_client/get-form/'</script>";?>
<?php endif; ?>

<?php if(isset($_GET['error'])): ?>
    <div class="alert alert-danger">
        <h3>Sorry! Unable to submit the form.</h3>
    </div>
<?php endif; ?>

<form name="order_form" method="POST" action="<?php echo esc_url( admin_url('admin-post.php') ); ?>" enctype="multipart/form-data" autocomplete="off" accept-charset="utf-8">

A few weeks ago everything worked fine. I turned off all the plugins, but the issue is still there.

Thanks for your help.