Witnesses Using Different Fork Versions

Ok, so the witnesses are not even using the same version as you can see in the above screenshot. I would really like to know what this is all about. Just in this screenshot I see the following:

22.1
22.2
22.333
22.4444

And there is also just plain 22.0.

Now just what the hell do these versions do? I saw a post by Hive account@timcliff where he says the 22.4444 is a version that doesn't take into account forks 22.2 and Sun's 22.5.

Can someone just tell me what the differences are?