@DoninGAI did uninstall previous year versions and reinstall the 2020 version again. I also made sure it runs as administrator. No difference. Same thing happens again.
@SteamTrainNo, this is not a comma vs period issue. As you see in my screenshots I actually enter a period not a comma for the decimal point. I use a US keyboard and my PC is a Dell XPS desktop, with Intel i5 CPU and US English settings, running up-to-date Windows 10 Home edition.
I also do not buy the software/CPU specific compatibility explanation. This happens only in Turbotax and only for many but not all numeric fields. There simply is not enough consistency to this bug to be attributed to anything other than a bug in Turbotax that was introduced a few years back when they decided to round dollar amounts to nearest whole dollar.
As for another PC, last year I started my 2019 on my laptop (a Dell XPS, Intel i7 CPU, Windows 10 Enterprise) because I was away from my desktop, and I had the same issue there, as well.
We have a REAL BUG in Turbotax software here. Now there are three things Turbotax and the community can do about it: (1) pretend this is not a Turbotax issue and try to blame it on something or someone else; (2) find work-arounds to live with it; or (3) take it seriously as a bug in Turbotax software and assign programming resources to find its cause and resolve it. Personally, I don't care for engaging with the first alternative. I have silently put up with the inconvenience of the second alternative doing my taxes with Turbotax for a couple of years now, including 2020. I think it is about time Turbotax engaged in the third alternative.
The fact that in 20 some years you have not encountered anyone reporting something like this does not make this issue any less of a bug or its impact any less significant. As I said, this bug showed up only a few years ago (not decades ago), and I concur with you that no one else seems to have reported it in the past. Nevertheless, no one knows how many people did actually encounter it in the past few years, but like me just silently found a way to work around it or perhaps even abandoned Turbotax altogether for other alternatives.
If anyone cares, my work-around is simply never enter cents and never skip over entries hitting Return, and ALWAYS check and double check each entry after Turbotax stops churning the latest entry. A laborious, inconvenient solution, but ... I've kept my fingers crossed for a couple of years hoping for the next version of Turbotax to be revamped enough not to have this bug. Finally this year, I decided to report it (and I'm sure people realize that properly reporting a bug and following it up is a quite time-consuming effort, actually).
The first thing a software, any software, must make sure it does correctly is that if I enter 10.47 by typing in a "1" a "0" a "." a "4" and a "7" following which I actually see "10.47" on the screen, then 10.47 should remain the value of the field once I hit the Return key, and the value of this field must remain 10.47 no matter how many times I visit it or open and close its containing form/list. Turbotax software fails this simple basic requirement of correctness! They better own it up.
