Board Thread:Support Requests - Getting Technical/@comment-1526346-20160807075254/@comment-1757994-20160807172242

By "category snapshots," I presume you mean images in a category gallery.

From Help:Categories
 * Category Gallery
 * By default, all categories on Wikia have a Category Gallery at the top of the category page itself. This shows a small image and link for each of the 8 most popular pages in that category. The image shown is usually the first image on each page.
 * If a page has no suitable graphics, then the first few lines of text will appear.
 * If you have a community where this display does not work well, you can add the magic word __NOCATEGORYGALLERY__ to the top of the page to remove it. You can also request that it be disabled on all pages through Special:Contact.

So ask Wikia to turn off galleries or use __NOCATEGORYGALLERY__ liberally in your categories.