Dropup menu only showing 1 dropup. CSS, HTML

image

The HTML for the dropdown menu is:

<div class="header">
  <nav>
    <ul class="cf">
      <li>
        <a class="dropdown" href="#">+</a>
        <ul>
          <li><a href="#">1</a></li>
          <li><a href="#">2</a></li>
          <li><a href="#">3</a></li>
        </ul>
      </li>
    </ul>
  </nav>
</div>

The CSS:

* {
        outline: none;
        padding: 0;
        margin: 0;
      }
      a {
        outline: none !important;
      }
      body {
        background-color: #231d1d;
        color: #925c69;
        font-size: 1.1em;
        font-family: Arial, Helvetica, sans-serif;
        outline: none;
        padding: 0;
        margin: 0;
      }

      .header {
        background: #231d1d;
        /*text-shadow: 0px 0px 6px rgba(255, 255, 255, 1);*/
        -webkit-box-shadow: 0px 5px 40px -10px rgba(0, 0, 0, 0.57);
        -moz-box-shadow: 0px 5px 40px -10px rgba(0, 0, 0, 0.57);
        width: 72px;
        margin-left: 1000px;
        margin-top: 30px;
      }

      nav ul {
        -webkit-font-smoothing: antialiased;
        list-style: none;
        margin: 0;
        padding: 0;
        width: 100%;
      }
      nav li {
        background: #231d1d;
        float: left;
        margin: 0 0 8px 0;
        padding: 0;
        position: relative;
        position: absolute; /*Drop Up Menu */
        bottom: 50px;
        border-radius: 6px;
        /*text-shadow: 0px 0px 6px rgba(255, 255, 255, 1);*/
      }
      nav a {
        color: #925c69;
        display: block;
        font: normal 24px/50px Arial, Helvetica, sans-serif;
        padding: 0 25px;
        text-align: center;
        text-decoration: none;
        -webkit-transition: all 0.25s ease;
        -moz-transition: all 0.25s ease;
        -ms-transition: all 0.25s ease;
        -o-transition: all 0.25s ease;
        transition: all 0.25s ease;
        border-radius: 6px;
      }
      nav .dropdown {
        background: url("../images/arrow.jpg") no-repeat right center;
      }
      nav li:hover a {
        background: #121212;
        color: #925c69;
      }
      nav li ul {
        float: right;
        right: 0;
        width: 150%;
        opacity: 0;
        position: absolute;
        top: 35px;
        visibility: hidden;
        z-index: 1;
        -webkit-transition: all 0.25s ease;
        -moz-transition: all 0.25s ease;
        -ms-transition: all 0.25s ease;
        -o-transition: all 0.25s ease;
        transition: all 0.25s ease;
        position: absolute;
        bottom: 50px;
      }
      nav li:hover ul {
        opacity: 1;
        top: 50px;
        visibility: visible;
      }
      nav li ul li {
        float: none;
        width: 100%;
      }
      nav li ul a:hover {
        background: #bbb;
      }
      /* Clearfix */
      .cf:after,
      .cf:before {
        content: "";
        display: table;
      }
      .cf:after {
        clear: both;
      }