I just asked the same thing that the OP did. Oops, I guess my exact verbiage DID deviate a bit. I used the numeral for 6 and specified in the US. Other than this, I don’t have any other settings or changes to have it respond to me in a specific way. Like I said, I don’t use it often.

I don’t live in the US, though, so maybe that is a factor as well?