Plugin Help Worldguard help with entry flag

I know this has been posted before and I have tried all of the steps others has posted but still not working.
I am trying to set a region that only a certain permission group can enter.

This is the steps Ive tried:
/rg define <region>
/rg flag <region> entry deny
/rg addmember <region> g:<permgroup>
/rg flag <region> entry -g nonmembers

After trying this several times it allows all groups to enter region. If I remove member then it denies access to all. Im running Worldguard version 6.2.1 and Worldedit version 6.7.1.3 all the latest version. Ive been trying for almost 2 days to do this. Any help will be appreciated. This is screenshot of region info with member set and every group can enter.

 

@bstormes
Have you seen this?
https://bukkit.org/threads/how-to-prevent-entering-region-worldguard-or-other-solution.94278/

 

Ive gotten it to work if I remove the inheritance from the next rank. It also works by adding player as member. I dont want to remove the inheritance from all groups cause I would have to add all the perms from previous groups tp each group. Does anyone know how to fix this?