Bootstrap 3表单控件未堆叠

如果您希望在字段之间保持干净的间距，则只需form-control从每个div中删除该类，因为它们是不必要的，然后为堆叠的div添加一些边距：

<div class="row">
    <div class=" col-lg-6 col-md-6 col-sm-12 col-xs-12">
        <div class="well sombra-externa">
            <div class="fonte-main"><h4>Complete seu cadastro!</h4></div>
            <legend></legend>
            <form id="completar-cadastro" class="form-horizontal clearfix">
            <fieldset>
                <div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
                    <label for="fisica"><input name="tipopessoa" value="fisica" id="fisica" type="radio"> Pessoa Física</label>
                </div>
                <div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
                    <label for="juridica"><input name="tipopessoa" value="juridica" id="juridica" type="radio"> Pessoa Jurídica</label>
                </div>
                <div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
                    <label for="nomecliente">Nome *</label><input name="nomecliente" class="form-control" value="" placeholder="Seu nome completo" id="nomecliente" type="text">
                </div>
                <div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
                    <label for="cpf">CPF *</label><input name="cpf" value="" placeholder="Insira seu CPF" id="cpf" type="text" class="form-control">
                </div>
                <div class="col-lg-2 col-md-2 col-sm-2 col-xs-2">
                    <label for="cpf">DDD *</label><input name="ddd" class="form-control" value="" placeholder="DDD" id="ddd" type="text">
                </div>
                <div class="col-lg-4 col-md-4 col-sm-4 col-xs-4">
                    <label for="cpf">Telefone *</label><input class="form-control" name="telefone" value="" placeholder="Insira seu CPF" id="telefone" type="text">
                </div>
                <div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
                    <label for="cpf">CEP *</label><input name="cep" value="" class="form-control" placeholder="Insira seu CEP" id="cep" type="text">
                </div>
                </fieldset>
            </form>
        </div>
    </div>
    <div class=" col-lg-6 col-md-6 col-sm-12 col-xs-12">
        <div class="well sombra-externa">colocar passos</div>

    </div>
</div>

以及一些CSS，以在每个堆叠层之间增加间距：

fieldset div {
    margin-bottom: 10px;
}

here地在这里。

在您的网站上，和中都 定义了以下内容：template.cssbootstrap.css

@media screen and (min-width: 768px)
select, textarea, input[type="text"], input[type="password"], input[type="datetime"], input[type="datetime-local"], input[type="date"], input[type="month"], input[type="time"], input[type="week"], input[type="number"], input[type="email"], input[type="url"], input[type="search"], input[type="tel"], input[type="color"], .inputbox {
   width: auto; 
}

您应该删除它，因为它会导致上面的问题。