Turbotax makes error on amended return

I need to amend my 2020 filing which has been e-filed and accepted by the IRS and my state, but Turbotax (desktop) seems to be making serious errors.  I'm sorry that the following explanation is rather long, but I've tried to be very careful to exactly describe things.  Can anyone give me any idea what's going on or how to fix it, please?  Or have you had a similar problem?

 

I followed the instructions to copy the tax file which was saved after the original filing.  When opening it, I chose the amend option.  I have not yet entered any of the changed information.  But the program shows a refund amount which is bogus.  It's not the original, just a seemingly random number.  The instructions say it should show $0 at this point, which makes sense.  If I go to forms mode and look at the 1040 form its an exact match to what I filed (I'm comparing it to my printed copy I made when filing.  If I look at the 1040X form, it shows wrong numbers in column A (original amount) on most of lines 1 thru 11, including the starting point, adjusted gross income.  Then column B shows a correction and finally column C shows the correct (original) values.  None of these values allow you to view their source, so I have no way of seeing where the strange numbers are coming from.  The differences are substantial, not just little round-off errors.  By the way, if I open the original tax file without initiating an amendment, the values are all still exactly what I filed.    I have also tried opening the copy of the original in normal mode and then going to forms mode and opening form 1040X.  That is immediately filled with the same erroneous data.  

 

I should mention that I also tried continuing and actually changing a value.  When I do this, the refund amount changes in an reasonable way, but still based on the erroneous starting point.

 

Thanks in advance for helping.

 

--John