With preferences you make concerning single files and folders it's easy to lose track of which files you have currently set as whatever you needed them to be. This is especially important for shared files and folders since you don't always want them to be shared with everyone.
Good thing there is a list with all shared files hidden on your system - to get to it search for Computer Management in the Start menu.
On the left pane of the CM window, browse for Computer Management (Local) > System Tools > Shared Folders > Shared:
You'll get a list of items here that are shared by your computer with path and description given.