Category Order could not understand your category HTML. Please do the following:

• Disable all plugins except for category order to see if some other plugin is causing the problem. If the problem goes away, re-enable each plugin until you find the incompatible one.
• Try switching to a different theme, like the WordPress default theme.

Once you have tried the above steps, email david@coppit.org with the results of these debugging steps. Also include the following information:

Original HTML:
<li class="cat-item cat-item-22"><a href="https://koutoku-kk.com/archives/category/assembly">assembly（組み付け）</a>
</li>
<li class="cat-item cat-item-17"><a href="https://koutoku-kk.com/archives/category/inquiry">お問い合わせ</a>
</li>
<li class="cat-item cat-item-23"><a href="https://koutoku-kk.com/archives/category/access">アクセス方法</a>
</li>
<li class="cat-item cat-item-15"><a href="https://koutoku-kk.com/archives/category/project">事業内容</a>
</li>
<li class="cat-item cat-item-14"><a href="https://koutoku-kk.com/archives/category/infomation">会社案内</a>
</li>
<li class="cat-item cat-item-20"><a href="https://koutoku-kk.com/archives/category/identifiable">個人情報保護方針</a>
</li>
<li class="cat-item cat-item-18"><a href="https://koutoku-kk.com/archives/category/machine">機械加工部門</a>
</li>
<li class="cat-item cat-item-19"><a href="https://koutoku-kk.com/archives/category/offer">求人情報</a>
</li>
<li class="cat-item cat-item-21"><a href="https://koutoku-kk.com/archives/category/weld">溶接部門</a>
</li>
<li class="cat-item cat-item-16"><a href="https://koutoku-kk.com/archives/category/cannery">製缶加工部門</a>
</li>

Processed HTML:
<li class="cat-item cat-item-22"><a href="https://koutoku-kk.com/archives/category/assembly">assembly（組み付け）</a>
</li>
<li class="cat-item cat-item-17"><a href="https://koutoku-kk.com/archives/category/inquiry">お問い合わせ</a>
</li>
<li class="cat-item cat-item-23"><a href="https://koutoku-kk.com/archives/category/access">アクセス方法</a>
</li>
<li class="cat-item cat-item-15"><a href="https://koutoku-kk.com/archives/category/project">事業内容</a>
</li>
<li class="cat-item cat-item-14"><a href="https://koutoku-kk.com/archives/category/infomation">会社案内</a>
</li>
<li class="cat-item cat-item-20"><a href="https://koutoku-kk.com/archives/category/identifiable">個人情報保護方針</a>
</li>
<li class="cat-item cat-item-18"><a href="https://koutoku-kk.com/archives/category/machine">機械加工部門</a>
</li>
<li class="cat-item cat-item-19"><a href="https://koutoku-kk.com/archives/category/offer">求人情報</a>
</li>
<li class="cat-item cat-item-21"><a href="https://koutoku-kk.com/archives/category/weld">溶接部門</a>
</li>
<li class="cat-item cat-item-16"><a href="https://koutoku-kk.com/archives/category/cannery">製缶加工部門</a>
</li>

Category pattern:
/http\:\/\/koutoku\-kk\.com.*?\/archives\/category\/(?:[^\/"]+\/)*([^\/"]+)/

Items:
Array
(
    [0] => <li class="cat-item cat-item-22"><a href="https://koutoku-kk.com/archives/category/assembly">assembly（組み付け）</a> </li>
    [1] => <li class="cat-item cat-item-17"><a href="https://koutoku-kk.com/archives/category/inquiry">お問い合わせ</a> </li>
    [2] => <li class="cat-item cat-item-23"><a href="https://koutoku-kk.com/archives/category/access">アクセス方法</a> </li>
    [3] => <li class="cat-item cat-item-15"><a href="https://koutoku-kk.com/archives/category/project">事業内容</a> </li>
    [4] => <li class="cat-item cat-item-14"><a href="https://koutoku-kk.com/archives/category/infomation">会社案内</a> </li>
    [5] => <li class="cat-item cat-item-20"><a href="https://koutoku-kk.com/archives/category/identifiable">個人情報保護方針</a> </li>
    [6] => <li class="cat-item cat-item-18"><a href="https://koutoku-kk.com/archives/category/machine">機械加工部門</a> </li>
    [7] => <li class="cat-item cat-item-19"><a href="https://koutoku-kk.com/archives/category/offer">求人情報</a> </li>
    [8] => <li class="cat-item cat-item-21"><a href="https://koutoku-kk.com/archives/category/weld">溶接部門</a> </li>
    [9] => <li class="cat-item cat-item-16"><a href="https://koutoku-kk.com/archives/category/cannery">製缶加工部門</a> </li>
)