I just went into a restaurant that charges per weight and they weighed mine at more than 1.5 pounds. My stomach cannot handle 1 pound, so I'm pretty sure the scale was rigged. What would you do if that happened to you and you already paid for it?
Maybe the restaurant was counting the pre-cooked weight and you're counting the cooked weight? Like I know when you order, e.g., a 1-lb steak from a restaurant that steak isn't going to actually weigh 1 lb... maybe 2/3 or 1/2 that...