I just had two people take my order in a drive thru. They alternated every question. First person welcomed me and asked what I wanted. The next person asked what size and drink I wanted. The first person came back on and asked if I wanted any cheese sauce then the second person came back on and told me the price. When I got up to the window the 2nd person was the one working the register. This happens from time to time at different places when I get lunch but I can't figure out why it is done.
Maybe not what happened to you, but some places hit you with an automatic message when you pull up and it can sound like a person trying to take your order.
I've been to some spots with these. Probably shown in some focus group to make things calmer or faster for folks. I'd want to know if the other employees working the drive through enjoy or hate having an automatic greeting.