Before we cooked them we had to equally divide the batch into 12 cookies. We calculated how much our dough weighed by 12 then that was how big each cookie had to be. Me and Kyla's batch was 353 grams and divided by 12 that equals 29 so we had to make each cookie 29 grams.
We finally divided them, some were exactly 29 and others were close to 29 grams. Before we put them in the oven we checked the weight on our test cookie again too see the before and after weight of them. After they came out of the oven we weighed it again and it ended up becoming lighter with 24 grams.
My theory for this was when we put it into the oven the cookie lost all it's moisture which contributed to making the cookie lighter in grams.