I found out that for some reason my Categories weren’t showing up at all, not even under “Categories” under “Posts”. I had to go to the database to remove them all there, because I could not make new ones (with the old names).
Now I can make new Categories and Tags, but somehow they don’t “stick”. When I put a blog in a category, it still registers as “Uncategorized” on the web.
And when clicking on the tags, leading to https://www.domain.com/?tag=life there’s nothing to show on that page…
What demon has taken hold of my Categories and my Tags, and how do I chase the demons away?