Ford does that weird crap. My Mustang had a similar setup for the innermost bulb on either side. I re-wired it so that the bulb lights up with the outer 2 and the tails sequence when the blinkers are on.

I wouldn't worry about that. It might even be a Canada thing. Kind of how Canadian spec Fords all come with Foglights automatically, but we have to buy the module if you want DRL inside the US.