Unwanted Folders Visible on Network

I have an iMac and a Macbook Pro on a network. When I enable File Sharing in System Preferences on the iMac a number of folders appear in Finder on the Macbook, even though they have not been marked as shared on the iMac. Can someone please help?

It would help if you could show us a print screen with the folder names.
At the moment we have no tangible info to work with.

Cheers ... McBie

Thanks McBie. I think I've just about worked it out. Something I set up when I was even less experienced than I am now.