If you are filing as Married Filing Jointly, all of your combined income is considered in determining whether your Social Security benefits are taxable or not (or partly taxable).
Look at your Modified Adjusted Gross Income (MAGI). The MAGI includes half of your Social Security, plus other sources of income. Once your MAGI exceeds the base amount for your filing status ($32,000 for Married Filing Jointly or $25,000 for all others), at least part of your Social Security income becomes taxable.
Since we can't see your tax return in this forum (or your 2021 return) I can't say why the IRS adjusted your taxable Social Security, but since it was in your favor, that's a good thing.
However, TurboTax does use the same calculations as the IRS in calculating taxable Social Security benefits.
Here's more info on Is My Social Security Taxable?
@DM103
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