Yes, @teh_g is correct, global moderators are special in that they will always have moderate privilege outside of the privileges page. Unfortunately it doesn't look as though you will be able to restrict gmods from their moderation privileges for this forum -- it's quite an odd use case!
Edit Post doesn't work in v1.7.5
Editing Posts doesn't work in nodebb v1.7.5
Edit: I just edited your post on v1.7.5 - @pitaj
@PitaJ i have downgraded to v1.7.4 and now it works fine.
v1.7.5 doesn't work for me.
there is a nodebb-popup after press save at the bottom of the page with "... lost connection to nodebb..." every time i try to save. The popup hides to fast to read it complete or take a screenshot. I use multiple ports in my config.json and nginx.
with v1.7.4 everything works fine.
@andreas-pcw can you look in the log for errors?