Eval() called multiple times?

I'm making a contact form with specific input details and am trying to make it so that each submission creates a node for permanent records. The code (posted below) works but the node is generated 3 times in a row. Does the EVAL() function get called three times? Has anyone else had this problem and/or know how to fix it?

Thanks in advance for serious replies!

<?php
if(!empty($_POST["submit"]) && !empty($_POST["fullname"]) && !empty($_POST["email"]) && !empty($_POST["question"])) {
  $node = new StdClass();
  //creating a bare node

  $node->type = 'contact_request';
  //giving it type

  $node->status = 1;
  //give it a published status

  $node->title = "Contact: ".$_POST['fullname']."-".$_POST["email"];
  //gives title

  $node->body = "<fieldset><legend>Question</legend>";
  $node->body .= $_POST["question"];
  $node->body .= "</fieldset>";

  node_save($node);
  //save it and give it the rest of the attributes

  echo "<h2>Question Submitted</h2>";
} else {
  if(!empty($_POST["submit"])){
    $missing_fields = 0;
    $output = "";

    if(empty($_POST["fullname"])){ 
      $missing_fields = 1;
      $output .= " Name ";
    }

    if(empty($_POST["email"])){ 
      $missing_fields = 1;
      $output .= " Email ";
    }

    if(empty($_POST["phone"])){ 
      $missing_fields = 1;
      $output .= " Phone ";
    }

    if($missing_fields == 1){
      $output = "Required Fields: ".$output;
      echo "<h2>".$output."</h2>";
    }
  }//end input check
?>
<form id="form-main" action="/contact-request" method="post">
    <fieldset><legend>How do we contact you?</legend>
    <div>&nbsp;</div>
    <span class="form-left"><label for="fullname">Name:</label></span>
    <span class="form-right">
    <input type="text" id="fullname" name="fullname" class="midb-grey" size="22" />
    </span>
    <div id="errorreport">&nbsp;</div>
    <span class="form-left"><label for="email">Email:</label></span>
    <span class="form-right">
    <input type="text" id="email" name="email" class="midb-grey" size="22" />
    </span>
    <div>&nbsp;</div>

    <fieldset><legend>What's your question?</legend> 
    <cite>Please describe what information you need.</cite>
    <textarea id="question" name="question" rows="10" cols="60"></textarea>
    </fieldset>
    <span class="form-right"><input type="submit" id="submit" name="submit" value="Submit" /></span>
</form>
<?php } ?>