Device Network

Macbook Pro 2012 OS X Yosemite 10.10.3 with a router, 2 users only. My ASL tells me i have 15 Devices connected to my network, when i have not set up a device to device network, Mission control shows 15 Desk tops, until i deleted the 15 desk tops. Sharing is turned Off, Bluetooth Turned Off, WiFi Turned off, " Spot Light" tells me nothing, about a network or any other devices. Firewall turned on with advanced Firewall options selected

Extensions have been turned off However in the Extensions window the share menu shows Mail, Messages and Airdrop have been ticked to be shared (now grey) i am unable to remove the tick.

also Windows PC sharing has been prohibited via Boot Camp Assistant but yet 4 apps " Network Pro", Who's on my Wi Fi, "Inet Network Scanner", and "Lanscan" all purchased from apple store all show another device is on the ADSL internet connection network 2 apps actually mention a Windows PC devices is on the internet network. Discussion with my ADSL Internet provider have been unsuccessful. I have previously undertaken Full reinstalls, replaced Hard Drives, purchased New Apple Computers this issue keeps returning any ideas on how can i find these 15 devices and this network many thanks in advance