Do you have a copy of your 2018 tax return and W-2 form so you can compare it to your 2019 information?
I would start there to confirm there were no significant changes. Sometimes wages increase but the corresponding withholdings do not increase accordingly.
I have attached a link which shows the changes in amounts of the standard deduction and exemption amounts for California from 2018 to 2019 tax returns.
CA standard deduction and exemption amounts
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