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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-266"><a href="https://blogs.bootsnall.com/J_WorLd/category/belgium" >Belgium</a> (2)
</li>
<li class="cat-item cat-item-1232"><a href="https://blogs.bootsnall.com/J_WorLd/category/cambodia" >Cambodia</a> (3)
</li>
<li class="cat-item cat-item-2857"><a href="https://blogs.bootsnall.com/J_WorLd/category/dc" title="Washington DC - news from the Capital. (actually Alexandria)">DC</a> (4)
</li>
<li class="cat-item cat-item-256"><a href="https://blogs.bootsnall.com/J_WorLd/category/england" >England</a> (3)
</li>
<li class="cat-item cat-item-2852"><a href="https://blogs.bootsnall.com/J_WorLd/category/foundation" >foundation</a> (1)
</li>
<li class="cat-item cat-item-262"><a href="https://blogs.bootsnall.com/J_WorLd/category/greece" >Greece</a> (1)
</li>
<li class="cat-item cat-item-2851"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-phan-nang" >Ko Phan Nang</a> (6)
</li>
<li class="cat-item cat-item-2854"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-phi-phi" >Ko Phi Phi</a> (3)
</li>
<li class="cat-item cat-item-2748"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-samui" >Ko Samui</a> (2)
</li>
<li class="cat-item cat-item-2316"><a href="https://blogs.bootsnall.com/J_WorLd/category/laos" >Laos</a> (2)
</li>
<li class="cat-item cat-item-2176"><a href="https://blogs.bootsnall.com/J_WorLd/category/malaysia" >Malaysia</a> (2)
</li>
<li class="cat-item cat-item-276"><a href="https://blogs.bootsnall.com/J_WorLd/category/mexico" >Mexico</a> (3)
</li>
<li class="cat-item cat-item-2178"><a href="https://blogs.bootsnall.com/J_WorLd/category/morocco" >Morocco</a> (4)
</li>
<li class="cat-item cat-item-2"><a href="https://blogs.bootsnall.com/J_WorLd/category/2" title="(test)">Preparation</a> (1)
</li>
<li class="cat-item cat-item-2856"><a href="https://blogs.bootsnall.com/J_WorLd/category/salisbury" >Salisbury</a> (4)
</li>
<li class="cat-item cat-item-282"><a href="https://blogs.bootsnall.com/J_WorLd/category/singapore" >Singapore</a> (2)
</li>
<li class="cat-item cat-item-2855"><a href="https://blogs.bootsnall.com/J_WorLd/category/southern-spain" >Southern Spain</a> (5)
</li>
<li class="cat-item cat-item-693"><a href="https://blogs.bootsnall.com/J_WorLd/category/spain" >Spain</a> (1)
</li>
<li class="cat-item cat-item-2853"><a href="https://blogs.bootsnall.com/J_WorLd/category/the-pen" >the pen</a> (8)
</li>
<li class="cat-item cat-item-132"><a href="https://blogs.bootsnall.com/J_WorLd/category/travel" >Travel</a> (39)
</li>
<li class="cat-item cat-item-964"><a href="https://blogs.bootsnall.com/J_WorLd/category/vietnam" >Vietnam</a> (2)
</li>

Processed HTML:
<li class="cat-item cat-item-266"><a href="https://blogs.bootsnall.com/J_WorLd/category/belgium" >Belgium</a> (2)
</li>
<li class="cat-item cat-item-1232"><a href="https://blogs.bootsnall.com/J_WorLd/category/cambodia" >Cambodia</a> (3)
</li>
<li class="cat-item cat-item-2857"><a href="https://blogs.bootsnall.com/J_WorLd/category/dc" title="Washington DC - news from the Capital. (actually Alexandria)">DC</a> (4)
</li>
<li class="cat-item cat-item-256"><a href="https://blogs.bootsnall.com/J_WorLd/category/england" >England</a> (3)
</li>
<li class="cat-item cat-item-2852"><a href="https://blogs.bootsnall.com/J_WorLd/category/foundation" >foundation</a> (1)
</li>
<li class="cat-item cat-item-262"><a href="https://blogs.bootsnall.com/J_WorLd/category/greece" >Greece</a> (1)
</li>
<li class="cat-item cat-item-2851"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-phan-nang" >Ko Phan Nang</a> (6)
</li>
<li class="cat-item cat-item-2854"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-phi-phi" >Ko Phi Phi</a> (3)
</li>
<li class="cat-item cat-item-2748"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-samui" >Ko Samui</a> (2)
</li>
<li class="cat-item cat-item-2316"><a href="https://blogs.bootsnall.com/J_WorLd/category/laos" >Laos</a> (2)
</li>
<li class="cat-item cat-item-2176"><a href="https://blogs.bootsnall.com/J_WorLd/category/malaysia" >Malaysia</a> (2)
</li>
<li class="cat-item cat-item-276"><a href="https://blogs.bootsnall.com/J_WorLd/category/mexico" >Mexico</a> (3)
</li>
<li class="cat-item cat-item-2178"><a href="https://blogs.bootsnall.com/J_WorLd/category/morocco" >Morocco</a> (4)
</li>
<li class="cat-item cat-item-2"><a href="https://blogs.bootsnall.com/J_WorLd/category/2" title="(test)">Preparation</a> (1)
</li>
<li class="cat-item cat-item-2856"><a href="https://blogs.bootsnall.com/J_WorLd/category/salisbury" >Salisbury</a> (4)
</li>
<li class="cat-item cat-item-282"><a href="https://blogs.bootsnall.com/J_WorLd/category/singapore" >Singapore</a> (2)
</li>
<li class="cat-item cat-item-2855"><a href="https://blogs.bootsnall.com/J_WorLd/category/southern-spain" >Southern Spain</a> (5)
</li>
<li class="cat-item cat-item-693"><a href="https://blogs.bootsnall.com/J_WorLd/category/spain" >Spain</a> (1)
</li>
<li class="cat-item cat-item-2853"><a href="https://blogs.bootsnall.com/J_WorLd/category/the-pen" >the pen</a> (8)
</li>
<li class="cat-item cat-item-132"><a href="https://blogs.bootsnall.com/J_WorLd/category/travel" >Travel</a> (39)
</li>
<li class="cat-item cat-item-964"><a href="https://blogs.bootsnall.com/J_WorLd/category/vietnam" >Vietnam</a> (2)
</li>

Category pattern:
/http\:\/\/blogs\.bootsnall\.com\/J_WorLd.*?\/category\/(?:[^\/"]+\/)*([^\/"]+)/

Items:
Array
(
    [0] => <li class="cat-item cat-item-266"><a href="https://blogs.bootsnall.com/J_WorLd/category/belgium" >Belgium</a> (2) </li>
    [1] => <li class="cat-item cat-item-1232"><a href="https://blogs.bootsnall.com/J_WorLd/category/cambodia" >Cambodia</a> (3) </li>
    [2] => <li class="cat-item cat-item-2857"><a href="https://blogs.bootsnall.com/J_WorLd/category/dc" title="Washington DC - news from the Capital. (actually Alexandria)">DC</a> (4) </li>
    [3] => <li class="cat-item cat-item-256"><a href="https://blogs.bootsnall.com/J_WorLd/category/england" >England</a> (3) </li>
    [4] => <li class="cat-item cat-item-2852"><a href="https://blogs.bootsnall.com/J_WorLd/category/foundation" >foundation</a> (1) </li>
    [5] => <li class="cat-item cat-item-262"><a href="https://blogs.bootsnall.com/J_WorLd/category/greece" >Greece</a> (1) </li>
    [6] => <li class="cat-item cat-item-2851"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-phan-nang" >Ko Phan Nang</a> (6) </li>
    [7] => <li class="cat-item cat-item-2854"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-phi-phi" >Ko Phi Phi</a> (3) </li>
    [8] => <li class="cat-item cat-item-2748"><a href="https://blogs.bootsnall.com/J_WorLd/category/ko-samui" >Ko Samui</a> (2) </li>
    [9] => <li class="cat-item cat-item-2316"><a href="https://blogs.bootsnall.com/J_WorLd/category/laos" >Laos</a> (2) </li>
    [10] => <li class="cat-item cat-item-2176"><a href="https://blogs.bootsnall.com/J_WorLd/category/malaysia" >Malaysia</a> (2) </li>
    [11] => <li class="cat-item cat-item-276"><a href="https://blogs.bootsnall.com/J_WorLd/category/mexico" >Mexico</a> (3) </li>
    [12] => <li class="cat-item cat-item-2178"><a href="https://blogs.bootsnall.com/J_WorLd/category/morocco" >Morocco</a> (4) </li>
    [13] => <li class="cat-item cat-item-2"><a href="https://blogs.bootsnall.com/J_WorLd/category/2" title="(test)">Preparation</a> (1) </li>
    [14] => <li class="cat-item cat-item-2856"><a href="https://blogs.bootsnall.com/J_WorLd/category/salisbury" >Salisbury</a> (4) </li>
    [15] => <li class="cat-item cat-item-282"><a href="https://blogs.bootsnall.com/J_WorLd/category/singapore" >Singapore</a> (2) </li>
    [16] => <li class="cat-item cat-item-2855"><a href="https://blogs.bootsnall.com/J_WorLd/category/southern-spain" >Southern Spain</a> (5) </li>
    [17] => <li class="cat-item cat-item-693"><a href="https://blogs.bootsnall.com/J_WorLd/category/spain" >Spain</a> (1) </li>
    [18] => <li class="cat-item cat-item-2853"><a href="https://blogs.bootsnall.com/J_WorLd/category/the-pen" >the pen</a> (8) </li>
    [19] => <li class="cat-item cat-item-132"><a href="https://blogs.bootsnall.com/J_WorLd/category/travel" >Travel</a> (39) </li>
    [20] => <li class="cat-item cat-item-964"><a href="https://blogs.bootsnall.com/J_WorLd/category/vietnam" >Vietnam</a> (2) </li>
)