Issue with bootstrap columns while nesting inside columns

The layout of page is miss-placed when columns are nested inside another column

<div class="container">
  <div class="row">
    <div class="col-6">
      <div class="col-6">
        <label>Name</label>
        <input type="text" class="form-control" />
      </div>
      <div class="col-6">
        <label>Name</label>
        <input type="text" class="form-control" />
      </div>
    </div>
    <div class="col-6"></div>

  </div>
</div>