Can you please report this at support@quantumwise.com, we'll want to know a bit more details of your machine that perhaps there is no need to communicate here on the public forum. Might be a bug, that "None" looks bad. On this machine, in Excel or similar, when you want to type 4.5, do you use period or comma?
In Python, what does this print?
import locale
print locale.getdefaultlocale()