Contact form keeps sending me blank emails - php

Question

I keep receiving blank form submissions from my contact form. The emails are all coming from "CGI Mailer", and have the form labels, but all the inputs are blank.
The form does work as it should otherwise.
<?php
$userName = $_POST['name'];
$userPhone = $_POST['phone'];
$userEmail = $_POST['email'];
$userMessage = $_POST['text'];
$honeypot = $_POST['firstname'];
$to = "email address";
$subject = "New Email From ";
$body = "Information Submitted:";
$body .= "\r\n Name: " . $userName;
$body .= "\r\n Phone " .$userPhone;
$body .= "\r\n Email: " . $userEmail;
$body .= "\r\n Message: " . $userMessage;
if( ! empty( $honeypot ) ){
return;
}else{
mail($to, $subject, $body);
}
header('Location: thanks.html');
?>
<form method="post" name="myForm" action="sendform.php">
<input name="firstname" type="text" id="firstname" class="hide-robot">
<input id="name" class="form-control" name="name" placeholder="Name..." required /><br />
<input id="phone" class="form-control" name="phone" placeholder="Phone..." required /><br />
<input id="email" class="form-control" name="email" placeholder="E-mail..." required /><br />
<textarea id="text" class="form-control" name="text" placeholder="How can we help you?" style="height:150px;" required></textarea><br />
<input class="btn btn-primary" type="submit" value="submit" id="submit"/><br /><br />
</form>