either the brakes need to be adjusted using the spring-tension adjusters or centering adjuster, or your front wheel has a dishing problem, or your fork is out of alignment.

how do you fix it?

I have an Iron Hose Maverick with disk brakes. When I drop the front wheel back in, if the axle sits properly in slots, then the brakes rub. I have to loosen the wheel, reposition it so one axle is not quite dropped right in, then tighten it there.

I took it back to the store - their answer was, "don't take the front tire off if you can avoid it"