Dependent care

My son is 2 and I work full time and my wife is a full time student. We paid over $5000 for day care fees and our AGI is below $125,000. But TurboTax is only giving us back $1500 dependent care  credit instead of 50% of the years daycare expenses (can claim up to $8000 for one child in year 2021 tax return). What am I doing wrong here?