It sounds like his 1095-A may be incorrect, if he did pay ACA premiums throughout the year and had less income than last year.
If you believe that you entered his 1095-A correctly into TurboTax (with the SLCSP amount in Column B) you could reach out to the Marketplace to verify the correct amounts for the 1095-A.
If you're using TurboTax Online, be sure to clear your Cache and Cookies first.
Here's more info on How is the Premium Tax Credit Calculated and Form 8962.
@rtonkinson
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