Deductions & credits

I have exactly the same issue with the online version.  I noticed a small typo in the 8938 so went back in to correct it and - bingo - everything is gone.  I need to re-enter everything from scratch.  There's clearly a bug here but I don't want to spend an eternity on hold.  I am also thinking of paying for the downloadable software as I am fed up having to re-enter the information time after time.