If you’re sure you used butter at the correct temperature, you may have accidentally ‘warmed’ your butter by mixing it with an electric mixer for too long.
Many cookie recipes start by creaming together the butter and sugar – this is just to combine the ingredients.
If you do this for too long, your room temperature butter will get super warm – and then you’ll face problem 1. all over again.
did you try reading the article?
Sorry homie, replied to the wrong comment instead of the other comment with the image including overmixed which I didn’t comprehend
Oh, lol, sorry for the sass in that case.