Those are all fake versions unless you are making typos. Audacity always has a three-digit version number with two dots separating the numbers.
I suggest you trash all your older versions then get 2.1.2 from us: http://audacityteam.org/download/.
See this topic for how to install Audacity correctly: https://forum.audacityteam.org/t/installation-do-not-run-audacity-from-the-dmg/31711/1
Gale