Contactform Name field problem

When I receive an email in my mailbox (Thunderbird), send from my build in contactform, then I see this in my Inbox message tab in Thunderbird:

(Email address hidden if logged out) < (Email address hidden if logged out) >
subject: blablabla

In other words: I do not see the Name of the sender. But I do have a name field in my form! Please see https://www.fotoloek.nl/contact/

In the email itself everything is okay like this:
Name: Example
E-Mail: (Email address hidden if logged out)
Subject: blablabla
Message: mesage text is okay

Because I want to see the subject from the sender in my mail client and not something like “subject=send from your mailform” I have added this code to my function.php file:

add_filter(‘avf_form_subject’,’avia_change_mail_subject’, 10, 3);
function avia_change_mail_subject($subject, $new_post, $form_params) {
$subject = urldecode($new_post[‘3_1’]);
return $subject;
}

I don’t know if this code is causing the issue with the Name field? Anyway; how can I set up the form like this:
– I want to see the name ocf the sender in the message field of my mail client and not (Email address hidden if logged out) < (Email address hidden if logged out) >
– I still want to see the subject in my mail client (like it is now thanks to the code in functions.php

Is this possible?

Thank you!