My MD state tax is not showing an amount.

You can try deleting your MD return and starting it again.  

1. Open your return
2. Select State Taxes from Tax Home
3. On the Status of your state returns screen
4. Select the trashcan icon next to your state
5. Then select Delete

In this same screen you can add the state and start it again.  

How do I delete my state return in TurboTax Online?
Troubleshooting common federal to state transfer issues