Utah is taxing you as a resident. If they are correct and Utah is your home state (meaning you're not just living there temporarily to attend school), then Utah can legitimately tax ALL your income, including your income from California. But in that situation, you can claim credit on your Utah return for the taxes paid to California, so your California income will in effect NOT be double-taxed.
If this describes your situation, you should have filed a non-resident return in CA (reporting the CA income) and a resident return in UT, reporting ALL your income but claiming credit for the taxes paid to CA.
In other words, if your state of legal residence - your home state - is Utah, then your taxable Utah income is indeed ~$80,000.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
