TurboTax is handling the HSA contributions in CA correctly.
The problem is in the IRS terminology.
"Employer" contributions are contributions THROUGH (not by) the employer. It is the code W amount in box 12 on your W-2.
The code W amount consists of contributions from your employer (if any) PLUS contributions by the taxpayer by means of payroll deduction.
So change your thinking about what "employer" contributions are - they are all contributions (whether by your employer or you) made through your employer and appearing on your W-2.
Do no adjust anything.
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