Why are my chocolate chip cookies more cakey than crispy or chewy?

I’ve been making Toll House Cookies since I was a kid. They used to be really good. In recent years, they seem to come out thicker, more cakey like. They used to be thinner, more crisp. The cookie part would essentially bake down around the chips and pecans. Totally great. Now, they “rise” more. Is it to much flour? Butter not soft enough? My sister, who NEVER baked or even cooked, started making them about 3 years ago and I’m telling you, hers are perfect. Just baked some this afternoon, but going to call her and ask her to bake some for me and mail them out asap.