Strange images in KB search result filters

I see odd images beside the Content Filter and Product Filters in my Knowledgebase (KB) search results.  What are they?  They look like icons but they're not clear images.  How can I use filters with these odd images?  I don't see an option to save my KB filters. I see strange images on the Knowledgebase search page in place of the "Collapse" and "Settings" images in filters on the left.
  1. Open Knowledgebase in your browser, https://search.blackbaud.com/#sort=relevancy.
  2. Press CTRL and R on your keyboard simultaneously to refresh your Knowledgebase cache.

Here's a screenshot of the odd images:

Strange images

Here's a screenshot of how the KB filter buttons should look:

KB filter buttons

Steps to Duplicate

  1. Search for something in Knowledgebase on Blackbaud.com
  2. Look at the filters on the left

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