Your MFJ status and income coming from both wages and self-employment create the issue. It is well explained in What Is Form 8959: Additional Medicare Tax - TurboTax - Intuit which states:
The Additional Medicare Tax only applies to the portion of your employment, self-employment and railroad retirement earnings that exceed the income thresholds for your filing status. You can find these thresholds in the instructions for Form 8959.
For tax year 2024, for example, if you are married and filing jointly, the tax only applies to income that exceeds $250,000 in combined earnings. On the other hand, if you were married filing separately, you could end up owing more tax, because the threshold is only $125,000.
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