A couple of months ago I started using HWiNFO plugin for Afterburner to monitor my CPU and GPU Voltages, I remember that voltages below 1V, were showing as 1V on Afterburner, so I spent a couple of hours figuring out what was, and to solve it I copied the Instance or format (I don't remember which one was) from one of the defaults data sources that had sub 1 (Insert Unit that I also don't remember) from Plugin data source properties.
Today, I nuked Msi Afterburner files, (because I was having issues with the graphics driver and if I opened Afterburner my GPU would go to idle Voltages and Clocks but all of that is off topic to this xDD, either way I resolved it by nuking Afterburner) and when setting everything back up I deleted all the defaults data sources that the Plugin has, so I tried what I did before, but everything was a dead end. The only thing that I remember, is that the thing that makes the number to go below 1 was ".2%" or something like that and you have to put that in (one of the things that are Inside the red circle of the attached image)

Edit: Clarify that with sub 1, I mean decimals xDDD.
Update: I found it in Reddit, i'm going to copy if it's useful to anyone; Try: "%.2f" You have ".0" which specifies zero decimal places. ".2" specifies two decimal places of precision.
btw it goes in format