Missing lines in Stockfish analysis

This happens a lot, especially with king moves: Instead of 3 lines as per my setting, I get only one. I'd like to know how bad the alternatives are, but no matter what I try, I get just that one line. Here is an example:

Browser doesn't matter, I have tried Mozilla and Chromium. Logged in or out doesn't change the state either.

I think it affects mostly (only?) king moves, but I'm not sure.

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