Why do we owe taxes to Maryland when we file the Maryland non-resident 505NR, despite receiving a K-1 indicating a loss?

My company is registered in VA, so I received a W-2 and a VA K-1 (profit). My husband's company is registered in MD, and he received a W-2 and a MD K-1 (loss) last year. We have been living in VA since 2018. Therefore, we need to file both Virginia resident and Maryland non-resident taxes. When I prepared the MD Form 505NR (non-resident income tax return), it indicated that we owe taxes to Maryland in the amount of $1500 or more. It just doesn't make sense to me since my husband's K-1 shows a loss. To my understanding, our W-2 and my K-1 income will be reported on Virginia tax forms, and only his K-1 will result in tax liability to Maryland if it has income. Now, since his K-1 shows a loss, there shouldn't be any taxes owed to Maryland. Am I right?

I don't know if I did something incorrectly. If not, could someone please help me understand it if TurboTax is actually correct?

Thank you very much!