I have a folder in a document library that requires special permissions, so I selected "Stop Inheriting Permissions" and then I selected "Grant Permissions". I then granted a security group Contributor-level permissions. I then checked permissions for this folder, and everything looked good.
The problem is that when I check permissions for other folders in that Document Library, that Group appears to have permissions to everything in the Document Library, as well as to the Document Library itself.
What's going on?