New MR60 - Windows file explorer doesn't see many devices

[MFL100]

I have a new MR60.with 11 devices attached by ethernet cable.  They are all visible on the router's website.  Three of the devices are Windows 10 computers.  However, on one computer, only six of the devices show on network file explorer, on another computer seven show and on the third nine show.  This lack of visibility did not happen with my previous router; every device showed on each computer..  I have tried every fix I could find online under Windows without success, so I am asking for advice here.  Thanks.

[FURRYe38]

I would contact MS support for help and information regarding there product. 
Check for same workgroup configurations. 

Check for any networking discovery configurations. 

Good Luck.