Each state calculates part year income differently. The state of Utah figures your total UT tax based on ALL of your income - and then a percentage is applied. The percentage of UT income is calculated by taking your UT sourced income and dividing it by your total income. Changing either number (UT sourced income or non-UT-sourced income) will change the percentage that is applied.
After you make a change, view TC-40B - Line 40 to see how the percentage changes. See Filing in Multiple States - Part-year residents follow each state's rules. Some states separate the income and tax only their state's income. Or, a state may tax all of the income as if you were a resident. Then, it allocates the tax based on in-state sources as a percentage of all sources.
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