Form action=""

Hi,

I’m trying to use my own form I’ve hand-coded, with HTML and PHP.
When I submit the form (front-end), I am redirected to a page showing:

Nothing Found
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This is my code

$form = true;

					if ($_POST['submit']){
						$errors = checkFields($_POST);

						if($errors){
							$error_content = '
							<div class="errors">
								<ul>';
							foreach($errors as $error){
								$error_content .= '<li>' . $error . '</li>';
							}
							$error_content .= '
								</ul>
							</div>';
						}
						else{
							$to = 'emailaddress';
							$from = "[email protected]";
							$subject = $_POST['name'].' has contacted you';
							$headers = 'From: ' .$from . "\r\n";
							$headers .= 'MIME-Version: 1.0' . "\n";
							$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";

							$message =
							'<table>
								<tr>
									<td width="300px">
										<table><tr><td width="100px">&nbsp;</td></tr></table>
									</td>
									<td>
										<img src="https://www.andrewnevins.co.uk/joe-tremlin-designs/images/full-logo.png" style="display: block; float: left; margin-left: 50px;" alt="Joe Tremlin Designs" />
									</td>
								</tr>
								<tr>
									<td width="300px">
										&nbsp;
									</td>
									<td>
										<a href="www.joetremlindesigns.co.uk" style="color: #E61B72; font-weight: bold; font-size: 13px; font-family: verdana, arial, sans-serif; text-decoration: none !important;">
											www.joetremlindesigns.co.uk
										</a>
									</td>
								</tr>
							</table>'.

							'<p style="color: #666; font-weight: lighter; font-size: 13px; font-family: verdana, arial, sans-serif;">'.
							'<span style="font-family: verdana, arial, sans-serif; font-weight: bold">'.$_POST['name']. '</span>' .
							' has filled out your Contact form.</p>'

							.

							'<p style="font-size: 14px; color: #1D70B7; font-weight: bold;"> Details: </p>'.
							'<p style="font-size: 12px"><span style="font-family: verdana, arial, sans-serif; font-weight: bold">Name: </span><span style="font-family: verdana, arial, sans-serif; ">' . $_POST['name'].  '</span><br />' .
							'<span style="font-family: verdana, arial, sans-serif; font-weight: bold">Email: </span><span style="font-family: verdana, arial, sans-serif; ">' . $_POST['email'].  '</span><br />' .
							'<span style="font-family: verdana, arial, sans-serif; font-weight: bold">Message: </span><span style="font-family: verdana, arial, sans-serif; ">' . $_POST['message'] . '</span></p>' ;

							$form = false;
							mail($to, $subject, $message, $headers);
						}
					}

					if ($form){
					?>
						<p>
							Or email me using this form:<br />
							<span class="bold">All fields required.</span>
						</p>
						<?php echo $error_content; ?>
						<div class="form clearfix">
							<form action="" method="post">
								<label for="name">Name</label>
								<div>
									<input required="required" type="text" value="<?php echo $_POST['name'] ?>" name="name" autofocus="autofocus"/>
								</div>

								<label for="email">Email Address</label>
								<div>
									<input required="required" type="text" value="<?php echo $_POST['email'] ?>" name="email"/>
								</div>

								<label for="message">Message</label>
								<div>
									<textarea required="required" rows="5" name="message"><?php echo $_POST['message'] ?></textarea>
								</div>
								<input type="submit" name="submit" value="send" class="submit" />
							</form>
						</div>

					<?php
						}
						else{
					?>
						<p>
							<span class="green bold">Thank you</span>&nbsp;<span class="green"><?php echo $_POST['name'] ?></span>&nbsp;for taking the time to contact me.</p>
							<p>I will try to get back to you through your email <span class="green"><?php echo $_POST['email'] ?></span>&nbsp;as soon as possible.
						</p>
					<?php
						}
					?>

Any idea why I can’t redirect to the same page?