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Your explanation makes sense from the TT side but not from the side of a paid returning customer, because of a bug or glitch in the process or the program. 
The TT technical specialist should be able to correct any obvious data glitch that the user uncovers only after paying up and seeing the lifetime tax return guarantee monogram.  At the very least, the customer after paying the fees should be allowed to exercise the nuclear option of Clear & Start Over option. That is not an unreasonable expectation.