Problem Bootstrap3 Layout

HTML

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="container">
  <form id="form_settings" class="form-horizontal">
    <div class="row">
      <div class="col-sm-12">
        <div class="panel panel-primary">
          <div class="panel-heading">
            Inhaberdaten
          </div>
          <div class="panel-body">
            <div class="row">
              <div class="col-sm-6 col-md-6">
                <div id="div_name" class="form-group required row">
                  <div class="col-xs-12 col-sm-4 col-md-4">
                    <label class="control-label" for="name" style="">Vor- und Nachname</label>
                  </div>
                  <div class="col-xs-12 col-sm-8 col-md-8">
                    <input class="form-control" name="inh_daten[name]" id="name" type="text">
                  </div>
                </div>
              </div>
              <div class="col-sm-6 col-md-6">
                <div id="div_strasse" class="form-group required row">
                  <div class="col-xs-12 col-sm-4 col-md-4 text-right text-left-xs">
                    <label class="control-label" for="strasse" style="">Straße und Nr.</label>
                  </div>
                  <div class="col-xs-12 col-sm-8 col-md-8">
                    <input class="form-control" name="inh_daten[strasse]" id="strasse" type="text">
                  </div>
                </div>
              </div>
            </div>
            <div class="row">
              <div class="col-sm-6 col-md-6">
                <div id="div_ort" class="form-group required row">
                  <div class="col-xs-12 col-sm-4 col-md-4 text-right text-left-xs">
 ...