Why is USPS taking my package farther away from its destination?

I live in PA and ordered something from NY a few days ago. Obviously these 2 states are right next to each other, yet apparently (going by the tracking information) my package started in Brooklyn, NY and is now in Minneapolis, MN...much farther away than it initially was. Why did USPS do this? Is my package headed somewhere it shouldn't be? Maybe I was provided the incorrect tracking number, but I don't think I was.