$1200 stimulus

When I file my taxes on 1040 form through turbotax I answered that I had received the $1200 stimulus.  I had the same income as 2019 and not in a different tax bracket and no different tax situation. 

Just for the sake of example I'm saying my return was $2000. Having stated I received the 1200 stimulus. 

I then went back and said I did not receive the 1200 and my return became 3200. 

Every article I could find about this since it was given out has said that receiving the stimulus would not reduce your return. 

What am I missing?

 

In this case it seems the 1200 was just an advance on your 2020 tax return.