On Norton Account, number of installs is different on "My Devices" vs. "My Services"

When I log in to MyNortonAccount.com and go to Devices, it says I have used eight installs.   When I go to Services, it shows that I've used seven installs.  The seven is correct.  I've matched the device names on the list with the actual computer names.  

I can't figure out where the extra one is coming from on the Devices screen.   There are two entries that are named "Windows-10" and Windows-10-1"  I don't know which machines they are.  Any thoughts on how to figure it out (aside from simply uninstalling and reinstalling every machine)?     Thank you.