Sharing a folder may lead to that folder being duplicated
Create a group.
Make a new folder. Right-click that folder, and share the folder. In the Known Groups tab, select the group that you created (anything that you're not in already). Click ok.
Under Share Details, in Groups, you have a button: accept invitation (or accept pending). If you click this, the folder that you shared will be duplicated in your Home.
I don't know how to resolve this without deleting all the data in this group. Probably: share with another user, make that other user admin of the group, have them accept these permissions, leave the group yourself, delete all of the data, and have that other user add you back to the group..