If your new scale is weighing you 8 lbs heavier than your last scale, that has NO IMPACT on what you've lost in the last 2 weeks. What it DOES impact is your starting weight. Your old scale weighed you at a starting weight of 280, and this new scale, which weighs 8 lbs heavier, would have weighed you at a starting weight of 288. Regardless, that cannot take away the accomplishment of 8 lbs lost.
on the 8 lbs!