I understood what you meant, but it works as it should when I reproduced it. The test member could see the stats when it was enabled, but not when disabled.
As Randy asked, is this the only group this member is part of? You cannot have the member in an unrestricted primary group, and then have restrictions in a secondary group. Well, you could, but none of the restrictions would be applied to the admin.
Why do you see the language key instead of the translated string? Is it like this for all other permissions?