my LMP date 9 dec 2022 and EDD 16 sep 2023 in ultrasound report doctor say your EDD is 10/10/2023. I can not understand how this possible?

A. Well actually that is weird it should have been somewhere around 15 to 20 September if I calculate nine months +1 week about 40 weeks when we talk about it should be somewhere on 15th to 20 September I think there is a miss judgement of miscalculation you need to check with your doctor