That was my understanding too; god gave one set of commandments to Moses at first, because I guess s/he couldn’t see what the Israelites were doing while he was talking to Moses? Then he gets pissed when Moses tells him, and gives the dumbed-down version. Supposedly that’s where you get Jesus saying that he fulfills the law, e.g., the laws of strict observances in Leviticus, Numbers, and Deuteronomy were because the Jews weren’t ready for a ‘higher’ law that used more personal judgement.