Federal return decreased

I just received that my federal tax refund has been adjusted, this year is the first time I’m filing married-filing jointly. We are also claiming my step son this year. I’ve always had my daughter as I’m a single parent to her….I’m so confused why they would do this we didn’t even make 150k someone please help before I have to call 🥺74D9161B-7D8C-433E-858A-696AA91C7A80.png