How do I turn off sharing? My iMac is listed 8 times/

Hi
This just started recently. my iMac is listed 8 times under sharing in the finder. I don't know what happened but it's starting to cause problems.
The only things that have changed recently is I upgraded to Yosemite but that was working fine. I just bought a new iPad but that connects through iTunes. I never clicked to share anything.
At home here we have 6 computers. 1 PC is my son's, one PC Laptop is my wife's. Both of those are only connected to WiFi for the internet. In my office I have my main iMac for internet and daily work, my Mac Pro which I only boot when I'm doing video work, my Mac Book Pro which I use rarely now that I don't shoot video in the field and 1 old HP. These are all connect to my network Hard Wired to my Airport Extreme plus a wireless Canon Printer. When any or all of these in my office are up and running I see them in the Finder (NOT under Sharing) and I can swap files between them.
Here's a screen-shot of my finder window.
I have to get rid of all those duplicate "ghost" version of my iMac.
Thanks for your help.
Allen

GOT IT FIXED! WOW!
I did better than filing a bug report. I went to Apple support, chose chat support. When it wanted $15 or was it $19 I filed an exemption which was a choice on the page, based on the fact that I recently upgraded to Yosemite.
Got the chat fellow and here we go!!!! ;-) First off he sent me this app so he could see my screen. Then he had me do a few things like move the system configuration folder to the desktop and repair permissions. Then he had me reset the SMC and Pram. Nothing helped, all the ghost computers still showed in the finder.
As a last resort he had me reset my Apple Airport Extreme. Wala! Ghost Computers GONE! He said it was a combination of stuff but mainly it was the airport extreme when I installed Yosemite. Something to do with my network. We'll see if it holds or if the problem comes back but as of now there's no more ghost computers in the sharing part of the finder.
Thanks to all who offered suggestions. I hope maybe this helps someone else.
Allen

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