Likely you are seeing the results of CO "add backs". CO starts with federal taxable income which means your itemized gambling losses (shown on line 16 on federal Schedule A) are already accounted for in your CO taxable income.
However, since federal itemized deductions include CO state taxes paid, CO has an "add back" of those state taxes paid to CO taxable income.
Further, if your income exceeds $300,000 your CO itemized/standard deduction is limited according your filing status (see below). CO has an "add back" of deduction amounts that exceed the limits below.
Single $12,000
Joint $16,000
Here is the CO income tax instruction for reference.
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