Stop Siri from speaking w/ 24-hr clock?

When I tell Siri on my iPhone, “Set an alarm for 10:45pm,” its voice responds, “Okay I’ve set an alarm for 22:45,” and the text on the phone also notates “22:45”… yet the Clock widget (correctly) shows “10:45pm”

I use a non-American Siri voice to speak to me - could that be why Siri is speaking in 24-hr time when I use 12-hr time?