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Good for you? The fact this happens on my versions of both MacOS and iOS means they didn't have automated tests covering this from day one.

Famously, "it works for me" is not how high quality software happens.

Good for me too? I get the correct answer when I type the keys, exactly as you specified. On both macOS and iOS

It seems basically impossible that math works differently on your calculator app than somebody else’s.

Can you post a recording of what you’re seeing?

What iOS version is that? It seems odd that the UI does not match what I see.

Whoa! What calculator is that?

Some googling shows hits from iOS 18 betas, where folks reported this bug, that seem to have the same UI.