loudandheard

I recently installed new rotors, pads, and ss brake lines about 2k-3k miles ago. When I first move the car after it has been parked the brakes squeak, what do you think could be the problem? The brake pads are akebonos and I made sure to bed them. The rotors have no scarring and are completely flat. The brakes stop well and the squeaking goes away once I'm moving. I also noticed that the front pads have a tendency to move when I reverse and brake and then move forward and brake.

Any ideas?