Even if they're trained on the same data, and I suspect they are, why maintain 2 unfathomably large and probably very similar sets of data

It still might be doing it on its own based on its own internal logic

Like maybe it's worked out that users who use miles expect the conversation to proceed in a different way than users who use kilometers and is tailoring its responses to fit those expectations.

Not that I'm ruling out that it's something deliberately coded into it by a longshot, just kind of pointing out another possibility

But both options are terrifying when you think about them.