MO tax on Social Security?

Missouri does not tax Social Security payments no matter how much income you have besides Social Security (as of Jan1 2024). 

I enter all my income and deductions (except for S.S. payments) into Turbo Tax and have a small state refund.  When I enter in my S.S. income for the year it says I owe over $1,000.

How do I find out if this is correct or not?