PHP form error only present in Internet Explorer - php

Question

I am working on a PHP form for bootstrap my site. (http://camp.impactak.com/signup.html) This form works perfectly in every browser EXCEPT internet explorer. It comes up with and error:
"Please correct the following error:
YOUR NAME
Hit back button and try again."
I put code in the PHP that should have eliminated an error message if some of the blanks are not filled. However, it still sends an error (only in IE)
PHP:
<?php
/* Set e-mail recipient */
$myemail = "erinpavek#gmail.com";
/* Check all form inputs using check_input function */
$name = check_input($_POST['inputName'], "Your Name");
$address = check_input($_POST['inputAddress'], "Street, PO Box, company");
$address2 = check_input($_POST['inputAddress2'], "Apt, Unit, Suite");
$village = check_input($_POST['inputVillage'], "Your Village");
$state = check_input($_POST['inputState'], "State, Providence, Region");
$zip = check_input($_POST['inputZip'], "Your Zip");
$tel = check_input($_POST['inputTel'], "Your Phone");
$email = check_input($_POST['inputEmail'], "Your E-mail Address");
$pname = check_input($_POST['inputParent'], "Parent/Guardian Name");
$subject = check_input($_POST['inputSubject'], "Message Subject");
$message = check_input($_POST['inputMessage'], "Your Message");
$select = check_input($_POST['inputSelect'], "Certified");
$select2 = check_input($_POST['inputSelect2'], "NonCertified");
/* If e-mail is not valid show error message */
if (!preg_match("/([\w\-]+\#[\w\-]+\.[\w\-]+)/", $email))
{
show_error("Invalid e-mail address");
}
/* Let's prepare the message for the e-mail */
$subject = "Someone has sent you a message";
$message = "
Someone has sent you a message using your contac form:
Name: $name
Address: $address
Address2: $address2
Village: $village
State: $state
Zip: $zip
Cell: $tel
Email: $email
Parent/Guardian: $pname
Certified: $select
NonCertified: $select2
Subject: $subject
Message:
$message
";
/* Send the message using mail() function */
mail($myemail, $subject, $message);
/* Redirect visitor to the thank you page */
header('Location: http://www.camp.impactak.com');
exit();
/* Functions we used */
function check_input($data)
{
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;
}
?>
HTML:
<form name="contactform" method="post" action="mailer.php" class="form-horizontal" role="form">
<div class="panel-body">
<form name="contactform" method="post" action="http://wedding-space.net/01_admin_resources/blog/contact_form/mailer.php" class="form-horizontal" role="form">
<div class="form-group">
<label for="inputName" class="col-lg-3 control-label">Full Name</label>
<div class="col-lg-9">
<input type="text" class="form-control" id="inputName" name="inputName" placeholder="First and Last Name">
</div>
</div>
<div class="form-group">
<label for="inputAddress" class="col-lg-3 control-label">Address1</label>
<div class="col-lg-9">
<input type="text" class="form-control" id="inputAddress" name="inputAddress" placeholder="Street">
</div>
</div>
<div class="form-group">
<label for="inputAddress2" class="col-lg-3 control-label">Address2</label>
<div class="col-lg-9">
<input type="text" class="form-control" id="inputAddress2" name="inputAddress2" placeholder="Apt, Unit, Building">
</div>
</div>
<div class="form-group">
<label for="inputVillage" class="col-lg-4 control-label">Village</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="inputVillage" name="inputVillage" placeholder="Village">
</div>
</div>
<div class="form-group">
<label for="inputState" class="col-lg-4 control-label">State</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="inputState" name="inputState" placeholder="State">
</div>
</div>
<div class="form-group">
<label for="inputZip" class="col-lg-4 control-label">Zip Code</label>
<div class="col-lg-8">
<input type="text" class="form-control" id="inputZip" name="inputZip" placeholder="Zip">
</div>
</div>
<div class="form-group">
<label for="inputEmail" class="col-lg-3 control-label">Email</label>
<div class="col-lg-9">
<input type="text" class="form-control" id="inputEmail" name="inputEmail" placeholder="Your Email">
</div>
</div>
<div class="form-group">
<label for="inputParent" class="col-lg-3 control-label">Parent/Guardian</label>
<div class="col-lg-9">
<input type="text" class="form-control" id="inputParent" name="inputParent" placeholder="Parent/Guardian Name">
</div>
</div>
<h5>Each student much choose one class from the either the Certified or Non-Certified class list: </h5>
<select class="form-control" id="inputSelect" name="inputSelect">
<option value="none">Certified Classes</option>
<option value="DriversEd">Drivers Ed. (get license, village youth only)</option>
<option value="NSTC">NSTC- (Seniors or 2014 graduates)</option>
<option value="LifeGuard">Life Guard Training</option>
<option value="ArcticSurvival">Arctic Survival Certification</option>
</select>
<br>
<select class="form-control" id="inputSelect2" name="inputSelect2">
<option value="none">Non-Certified Classes</option>
<option value="cook">Cooking</option>
<option value="Art">Arts from the Earth/Crafts</option>
<option value="poetry">Creative Writing/Poetry</option>
<option value="guitar">Guitar Lessons</option>
<option value="engineering">Science and Engineering</option>
<option value="drama">Drama/Acting</option>
<option value="taeKwonDo">Tae Kwon Do</option>
<option value="sodHouse">Sod House Design</option>
<option value="SkinSewing">Skin Sewing</option>
<option value="DrumDance">Drum Dancing</option>
<option value="Aviation">Aviation</option>
<option value="Rap">Rap/Hip-Hop Class</option>
</select>
<br>
</form>
<div class="form-group">
<div class="col-lg-offset-2 col-lg-10">
<button type="submit" class="btn btn-default">
Sign Up
</button>
</div>
</div>
</form>
</div>
</div>

Answer 1

The answer was staring us in the face.
You put a form in a form.
That is not allowed.
you cant have forms submit forms.
Please readjust your markup accordingly to not have forms in Forms, they can be siblings though. Problem solved.
You have:
<form><form></form></form>
You need to either remove the inner form, or separate it out:
<form></form>
or
<form></form>
<form></form>