If you owe California tax this year, they may be trying to determine whether to assess an 'underpayment penalty'.
If they see you had enough withheld to cover last year's taxes, and this year may just be an anomaly due to some unexpected income (that didn't have tax withheld), they may not assess a penalty this year for underpayment of tax.
Since we can't see your return in this forum, this is what I am guessing. You can Contact TurboTax Support where they can look at your return to give you a more definitive answer.
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