You said that your net income was $15,000 but that only $11,000 was for notary services. Did I understand that correctly?
If so, you would owe SE tax on the $4,000 difference. Why would you think that you would owe no taxes?
And you DID get to remove your notary income when you made the adjustment. The screen appeared with the $15,000 already filled in. TurboTax is thinking at this point that all of your Schedule C income is notary income. But, of course, that is not correct.
So when you changed the amount to $11,000, TurboTax recalculated the SE tax to exclude only the notary income. This would have increased your SE tax by some $600 ($4,000 times 15.7%).
When you made the adjustment, you were correcting a bad assumption by TurboTax, which you needed to do.
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