Permissions Question

So, i have an admin section, (category) containing two admin forums.

One is for just admins, the other is for admins+moderators.

I've granted the allow on the category for admins + mods.
I've granted allow on the admin forum for admins, and deny for mods.
I've granted allow on the mod forum for admins + mods.

So if i login as admin i see both forums in the admin section.

If i login as mod i see one.

If however, i add moderator to my secondary group on my main (admin) user, the admin forum also vanishes.

Shouldnt the Allow in my main usergroup over-ride the deny in the moderator section on that sub forum ?