My husband installed our Britax B-Safe carseat and base yesterday using the latch system. The base is firm and doesn't move, but the carseat itself wobbles/moves in the base when I try to see if it feels secure. I'm guessing this is user error, and we're going to take it to a local EMS place to have it checked... but I'm wondering if anyone else had this problem? I was hoping it was a simple fix that we missed since we're newbies to this whole thing!