Sorting devices by release year shows duplicated values

            </ul>

          </td>

          <td class="release">

            {% assign release_date_array = "" | split: ',' %}

            {% if device.release[0] %}

              {% for release_date_obj in device.release %}

                {% for release_date_pair in release_date_obj %}

                  {% assign date = release_date_pair[1] | split: '-' %}

                  {{ date[0] }} <br />

                  {% assign release_date_array = release_date_array | push: date[0] %}

                {% endfor %}

              {% endfor %}

            {% else %}

              {% assign date = device.release | split: '-' %}

              {{ date[0] }}

              {% assign release_date_array = release_date_array | push: date[0] %}

            {% endif %}

            {% assign releasedates = release_date_array | uniq %}

            <ul class="list-unstyled">

            {% for releasedate in releasedates %}

              <li>{{ releasedate }}</li>

            {% endfor %}

            </ul>

          </td>

              <td class="size">{{ device.screen | replace: 'in','"' }}</td>

              <td class="battery">

  margin-left: 10px;

}

ul.list-unstyled,

ol.list-unstyled {

  margin-left: 0;

}

.jobs-table th:first-child {

  width: 25%;

}