the form element:
<form action="guest-profiles.php" id="Guest" name="Guest">
does not set the method. the Default method that is used when none is specified is the GET, the insert needs to have the method use the Post method.
edit the form tag to set the method to post:
<form action="guest-profiles.php" id="Guest" name="Guest" method="post">
in the future, please don't paste the code int your message, instead attach a the page to the post.