Problem Bootstrap3 Layout

by S.

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">
						<fieldset>
							<div class="col-sm-6 col-md-6">
								<div id="div_name" class="form-group required">
									<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">
									<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 class="col-sm-6 col-md-6">
								<div id="div_ort" class="form-group required">
									<div class="col-xs-12 col-sm-4 col-md-4 text-right text-left-xs">
										<label class="control-label" for="ort" style="">PLZ und Ort</label>
									</div>
									<div class="col-xs-12 col-sm-8 col-md-8">
										<input class="form-control" name="inh_daten[ort]" id="ort" type="text">
									</div>
								</div>
								</div>
							<div class="col-sm-6...