It depends. Owing state taxes can result from personal changes, job transitions, side jobs, and eligibility for tax credits and deductions.
It could also occur because you withheld too little for state taxes, or your earnings changed your entitlements to certain tax credits, such as the Earned Income Credit.
You can owe state taxes while being up to date with your federal tax bill because the state tax brackets are different. See here for the California rate schedules.
You might check your W-2s or other information returns to see whether your State withholding was less than expected.
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