Amending taxes:before entering any changes, I see "$311" on the monitor for federal taxes due

Amending taxes: before entering any changes to my tax return, I see "$311" on the monitor for "federal taxes due".  Why would it show this value when I haven't entered any changes to the return yet? 

On my original return that I mailed in I owed $40,000 and sent that check in already with the return.