What happened to this added directory in environment variables path?

Question

Added the following directory to the path by using this method:

set path=%path%;D:\Programm\jflex-1.8.2\jflex-1.8.2\bin
set path=%path%;D:\Programm\jflex-1.8.2\jflex-1.8.2\bin\jflex

but, I can't find it in GUI (user/system):

https://i.sstatic.net/kVn56.jpg

But by using echo(%path:;=&echo.% got this:

https://i.sstatic.net/ZQ9j7.jpg

Now I've got a few problems:

1. How do I remove jflex from the path using cmd (preferably)?
2. Where is it? Cause I can't see it in system environment values but somehow it's still there (with cmd)?
3. Update1: What just happened?

BTW the jflex command does work, so it is in path and working perfectly fine.

Update0: Not in Registry (I think I looked at the right place, if not tell me):

https://i.sstatic.net/Vhy0X.jpg

Update1: Ok, now this is weird, now it's gone...what happened exactly?

https://i.sstatic.net/Ako0J.jpg