Why different cURL platforms output different results? Simple cURL POST request

I'm testing something very simple with curl. I've got a PHP server (7.4.30) from a provider which has a page called: form.php. The form.php contains the following code:

<html>
......
  <?php

    echo "Name here::: ";

    if(isset($_POST['submit'])) {
        echo $_POST['name'];
    }

  ?>
......
</html>

All I'm doing is sending post data to this endpoint via:

curl -L http://www.domain.tld/test/form.php -H "Content-Type: application/x-www-form-urlencoded" -d "name=Nde&submit=Submit"

All I'm expecting in the output is to see my name I submitted via curl, but it doesn't. I get: "Name here::: " but nothing else.

 <body>
  Name here:::
 </body>
</html>

When I run the exact same curl command via reqbin.com/curl, it does exactly what I want, showing the name in the html content output.

<body>
    Name here::: Nde
</body>

</html>

I also tried via Git Bash, but it returns the same result as windows curl and I also tried to simulate a POST request via the same server and PHP curl but all seem not to accept my POST data.

I also happen to have another provider and when I do the exact same test on their server, everything works. So it must be something on my provider side, but I have not the faintest idea what the issue could be, given that depending on where I run curl from, it still works.

Does anyone know why I have different results depending on where I run the curl code from?

Thank you



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