Help me understand the non-resident state tax calculation

Hello,

 

I am living in Texas full time and have a rental property in Minnesota. I am filling for non-resident state tax for Minnesota.

 

The only income I have from Minnesota is my rental income, which is about $18,000 after deduction/credits.

 

Shouldn't my MN state tax be calculated only based on that rental income? It seems like I get taxed for my total federal gross income. My wages and salaries are not generated in MN.

 

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