When using guided navigation, the categories are cached every 24 hours for a faster response to customers. If you make changes to products (pricing, images, etc.), these changes will not appear on categories with Guided Navigation turned on, until the site re-indexes the category page.
If you want to have a category re-indexed right away, you can do so from Settings > Content Delivery Network (CDN). Here you can purge Guided Navigation indexing or specific files (usually image or CSS files).
Select the type of file from the radio button, and choose which category you wish to purge. Only categories that contain Guided Navigation templates in their category or subcategories are listed. Purging the category will purge all subcategories under the category as well.
Upon submitting your request, it takes about 15 minutes to fully purge, re-index, and start to propagate. You may also need to refresh your browser's local cache to see the changes.