I watched a YouTube video today, where a chef showed the difference between measurements of a level cup of flour right out of the package and that same measurement after she sifted it. She had put 3 cups in and got almost 4 cups after it was sifted. I was very surprised because most of our flours say pre-sifted. She used a wire strainer similar to this
https://www.webstaurantstore.com/tab...ent=Smallwares
So, I would guess you had too much flour in your mixture. And the eggs are smaller these days. I have had problems with some oatmeal cookies I have made lately. I am guessing this is my problem too.