About $19,000 was added to my taxes owed from "OUNSSMRR", what is that?

[AmyC]

We can't see your forms or entries. You will need to review your forms and locate that entry. If you imported forms, it could be in there as well.

To see your forms:

• In desktop, switch to Forms Mode. 
• For online, see How do I preview my TurboTax Online return before filing?

[VolvoGirl]

Where do you see "OUNSSMRR"?   And what line on the 1040 is the extra 19,000?

Are you using the Online version?  Before filing you can preview the 1040 or print the whole return
https://ttlc.intuit.com/community/accessing/help/how-do-i-preview-my-turbotax-online-return-before-f...