Okay I tried to file first then it tried charging me then I got the free edition then when I go to file it says I have to amend my tax file? Why? I'm so lost and confused

It said my social had been used before but I got an expert through the chat and she showed me how to clear it and re-enter it my whole tax information so I don't understand how come I have to amend my taxes now? What did I do wrong to have to amend my taxes with the IRS?