Multiple Categories selected on Posts showing in Navigation

On my website: https://www.savingcontent.com

We post News, Previews, and Reviews all on the front-page. Sometimes it may contain a video, so we give it both a category of News AND Video, essentially multi-categorizing it.

Now, when you read the individual post (and this may be a limitation or issue with the theme that I’m using), but it will show both parent categories as “selected” (so to speak) in the navigation. I would like to have it show only one selected.

EXPECTED:
News would supersede Video, and should only show the News category. Now if I clicked the Video category, that post would show up in the results, but NOT show selected for News.

If you need specific examples or more information, please let me know. Thank you in advance.