I've never heard of this problem with Lee before, maybe there stuff just works here in Alabama. Have you checked to see if you were dealing with a compressed charge, if so it was supposed to fill the case to the mouth. You calabrate an electronic scale but you zero a ballance beam. I suspect you may have excess air movement in your room, which will screw up any scale, no matter what type or brand. When weighing powder you want absolutely no air movement. You could have a bad scale but since you state that you are new to this hobby I suspect operator error, and if I'm right it will be there with any scale you decide to buy. I've had the RCBS 510 scale the Hornady scale and the LEE and all worked as advirtised, with the LEE taking a back seat to no one!