Incorrect field names
'author' =>
'<div class="row padding-xs-top">
<div class="col-md-4 col-sm-4">
<div class="form-group ct-form-group-label--float"><label for="contact_name">' . '</label> <span class="required"></span><input id="contact_name" name="author" class="form-control input-lg" type="text" value="Name *"' . esc_attr( $commenter['comment_author'] ) . '" required="required" /></div></div>',
'email' =>
'<div class="col-md-4 col-sm-4">
<div class="form-group ct-form-group-label--float"><label for="contact_email">' . '</label> <span class="required"></span><input id="contact_email" name="email" class="form-control input-lg" type="email" value="Email *"' . esc_attr( $commenter['comment_author_email'] ) . '" required="required" /></div></div>'