I've re-read this thread now, and have tried to get a grasp on why you suggested the OPs use your defuddler, in order to understand what is going on.That calculator looks okay, but it does suggest using insoluble chalk, which you can use, but you have to be very "clever" to get what you want from it: I would not recommend trying to use "chalk". The calculator also goes on a lot about "CaCO3"; again, you can use it, but you have to be very "clever" to get what you want from it: I would not recommend trying to use "CaCO3" constructs either (yes, they are "constructs", not real things).
Same with the Brewfather software. I believe Kai Troester has something to do with it? A very clever chappie (Kai that is) who is perfectly capable of using "chalk" and "CaCO3" constructs to his advantage. Unfortunately, I don't think he realises the havoc he creates pushing those arcane methods onto us mere mortals.
It seems like you were happy with the Ca, Mg, Na, SO4 and CL from the water reports, but you weren't happy with the CO3/HCO3.
I get that figure from Salifert water tests, so I don't think I need to try to understand the defuddler.
Incidentally, with my water the HomeBrewForum calculator has never suggested that I add chalk, so that particular problem hasn't arisen.
I commend you for attempting to help other people with their water chemistry, although I have found this discussion rather baffling!
Cheers