TurboTax was correctly determining your Maine standard/itemized deduction. For your filing status, the Maine Standard Deduction is $30,000. Itemized Deductions in Maine are capped at $36,300. Maine also follows your Federal filing so that you are required to use the Maine standard deduction if taking the Federal standard deduction, and using itemized deductions in Maine if you itemize on your Federal return.
When you had the standard deduction forced on the Federal Return, then switched to itemizing, this caused you Maine income to decrease by the difference between the itemized amount of $36,300 or the standard amount of $30,000. The additional deduction of $6300 for itemizing caused your refund to increase in Maine by $365. This is the expected outcome.
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