Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
They do get a little stuck on sometimes. I normally will spray some WD-40 all around the center hole and some in the lug studs and then place a hammer on the hub, (between the studs) and hit it with a second hammer. Working around the middle part of the hub.
Some I even hit from the rear of the rotor with a rubber hammer, when they are real stuck.