Are you married filing separately or RDP filing separately? In this case, If your spouse is itemizing, then you must also itemize, which would cause TurboTax not to use the Standard Deduction.
FTB instructions for Form CA (540):
Line 30 – Amount from Line 29 or Standard Deduction
If your filing status is married/RDP filing separately and your spouse itemizes, enter the amount from line 29 (even if the standard deduction is larger).
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