The amounts shown in Box 16 on your W-2s for State Wages (one for DC, one for CA) SHOULD add up to the amount in Box 1, Total Wages for that employer. If they don't, I can see you are confused!
You could also take your Total Income (Box 1 amount) divide by 12 and multiply by number of months lived in each state.
However, it is much easier to report if your employer has Allocated your Total Income for you between CA and DC on your W-2s.
Since we can't see your return in this forum, you may need to request Phone Support if you can't resolve your issue.
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