Blog css, uni-col and multi-col

Hi Drew, yes I've done that and added <perch:categories> to post.html. The classes uni-col and multi-col are added by Perch. I can't see why one category would have the class multi-col added and another has uni-col added? There's no difference in how I'm adding to post.html?

Yes I know but it's messing up the control panel (see screenshot). Is there a setting somewhere?

Not sure if it's a bug. Inspecting the html shows that a different class is added to the markup. uni-col to the article type and multi-col to the others?

No template used. This is part of the Perch control panel?

Here's my post.html file...

<article class="h-entry">
    <h1>
        <a href="<perch:blog id="postURL" type="hidden" />" rel="bookmark" class="p-name">
            <perch:blog id="postTitle" type="text" label="Title" required="true" size="xl autowidth" order="1" />
        </a>
    </h1>
    <p class="meta">
        <time class="dt-published" datetime="<perch:blog id="postDateTime" type="date" label="Date" time="true" format="Y-m-d H:i:s" divider-before="Meta information" />">
            <perch:blog id="postDateTime" type="date" time="true" format="%d %B %Y" /> 
        </time>
        <perch:if exists="authorGivenName">
            by <span class="p-author h-card"><perch:blog id="authorGivenName" type="hidden" /> <!-- <perch:blog id="authorFamilyName" type="hidden" /> --></span>
        </perch:if>    
        <perch:categories id="Brands" set="brands" label="Brands" display-as="checkboxes">
            <a href="archive.php?cat=brands/<perch:category id="catSlug" type="slug" />" class="p-category">
                <perch:category id="catTitle" type="text" />
            </a>
        </perch:categories>
        <perch:categories id="Building-type" set="building-type" label="Building type" display-as="checkboxes">
            <a href="archive.php?cat=building-type/<perch:category id="catSlug" type="slug" />" class="p-category">
                <perch:category id="catTitle" type="text" />
            </a>
        </perch:categories>
        <perch:categories id="Pipework-application" set="pipework-application" label="Pipework application" display-as="checkboxes">
            <a href="archive.php?cat=pipework-application/<perch:category id="catSlug" type="slug" />" class="p-category">
                <perch:category id="catTitle" type="text" />
            </a>
        </perch:categories>
        <perch:categories id="Article-type" set="article-type" label="Article type" display-as="checkboxes">
            <a href="archive.php?cat=article-type/<perch:category id="catSlug" type="slug" />" class="p-category">
                <perch:category id="catTitle" type="text" />
            </a>
        </perch:categories>
    </p>
    <perch:if exists="image">
        <div class="margin-20">
            <img src="<perch:blog id="image" type="image" label="Image" order="4" />" alt="<perch:blog id="postTitle" />" />
        </div>
    </perch:if>
    <div class="description entrey-content hidden">
        <perch:blog id="excerpt" type="textarea" label="Excerpt" markdown="true" order="3" size="s" />
    </div>
    <div class="description e-content">
        <perch:blog id="postDescHTML" type="textarea" label="Post" order="2" editor="markitup" markdown="true" size="xxl autowidth" required="true" />
    </div>
</article>

<perch:blog id="image" type="image" suppress="true" />