California has their own premium assistance above and beyond the federal premium assistance. That is why for 2020 California has their own form 3895. If your income is between 400 - 600% of the FPL (Federal Poverty Limit) then you would qualify for California assistance but not Federal. I am not well versed enough in all of the income limits to know if you could qualify for both if your income is between 135 - 400% of the FPL. I definitely believe that it would be possible to qualify for Federal subsidy (which apparently you did not have deducted from your health insurance premium, lines 21c - 32c on 1095A) and have had too much California subsidy (which apparently must have been deducted from your health insurance premium, lines 6c - 17c on 3895). This would result in the situation that you describe. The only way to know for certain (if you don't think that TurboTax is doing it correctly) is to go through the California Form 3849 by hand following the instructions. You can download the forms and instructions from the FTB. This is the first year that California has provided a premium subsidy and I believe that California is the only state to provide subsidies to it is probably confusing to the TurboTax software writers.
