Yes I had the exact same problem. I put all of my information in except the info from letter 6419 because I hadn't received it yet. My refund was showing it would be over $4000. I knew I would lose the $1500 from my 1 dependent I had received payments for. But instead my refund dropped all the way down to $600 just by adding the $1500 advanced payments. I am still owed the remaining $1500 from the CTC!! I was not happy with this at all but with it being the last week to file I sent it in anyway.
