Refreshing the page on Worldbuilding a few minutes ago, I was surprised to encounter this:
I'd no filters engaged, nor was I changing tabs, just refreshing as stated.
This resolved on another refresh of the page and delivered the expected "Questions" tab contents.
I'm jut putting this here assuming that it's a temporary glitch, perhaps a few bits lost in transit and won't repeat - so this post is for reference of anyone encountering this in future and should anyone wish to investigate.
Related: "Perhaps you'd like to select a different tab?" - but relating to the "featured" tab and was 13 years ago.