What is your full version number? If you open the command prompt it should say something like Microsoft Windows [Version 10.0.17134.???]. You could also run 'ver'.
You should probably be looking at the calculator version (menu button -> About. mine is 10.1806.1821.0, and has this problem) rather than the OS version. Apps can be updated independently of the OS.
Whoa, very interesting, great call! I see 10.1712.10601.0 as the version for mine. Why would it not have updated along with the rest of Windows? EDIT: Oh, because I've disabled automatic app updates. :-)
