Can I adjust the amount turbotax thinks I qualify for for child tax credit? It is incorrect.

Turbotax thinks that I qualify for the child tax credit, but says I received more in advance payments than I qualify for. It says I have to pay some back. Our main home was not in the USA for more than 6 months, but by my calculations we should therefore get $3187 (our tax liability)   $1400 per child ($1400*6=$8400) which means we should get $11587. We received advance payments of $9300, so we should still get $2287 as a credit on taxes. Turbotax says instead of getting a credit we will have to pay some back, although it doesn't show any specifics. How can I fix this? Thanks!