Contact form results appearing in different format

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PHP

Unicode

HTML5

Hi guys I am having an issue where my contact form returns results in a different text format and I was wondering if there is perhaps anything wrong with my header in my contact form php.

I get results such as:

цветник на могилу цветник на могилу

(Example email where someone filled in the contact form and this was the result when I received the email.

Issue I have is when someone fills in the contact form in a different language I get strange unicode characters

$mail->isHTML(true);

$mail->Subject = $subject;
$mail->msgHTML($emailTextHtml); // this will also create a plain-text 
version of the HTML email, very handy


if(!$mail->send()) {
    throw new \Exception('I could not send the email.' . $mail->ErrorInfo);
}

$responseArray = array('type' => 'success', 'message' => $okMessage);
}
catch (\Exception $e)
{
// $responseArray = array('type' => 'danger', 'message' => $errorMessage);
$responseArray = array('type' => 'danger', 'message' => $e->getMessage());
}


// if requested by AJAX request return JSON response
if (!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && 
strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
$encoded = json_encode($responseArray);

header('Content-Type: application/json');

echo $encoded;
}
// else just display the message
else {
echo $responseArray['message'];
}

What I have tried:

I have tried converting the text and seeing if it is text, for we get spam emails at times