You must have either started the 2016 tax return as an amended return or clicked on Amend when fixing the errors you discovered.
See this TurboTax support FAQ for removing an amended tax return when using the desktop CD/Download editions - https://ttlc.intuit.com/community/amending/help/how-do-i-cancel-or-undo-an-amended-return-in-the-tur...
