Yes I do have a "addnode=127.0.0.1" in my bitcoin.conf

Also I use Armory but I'm pretty sure it wasn't running that day, and when it's Armory, it's just ONE inbound connection at 127.0.0.1:xxxxx and also bitcoin core tells it is Armory

By the way this morning I found it again.    Restarted bitcoin core and it only gets normal inbound connections.
It looks like those two inbound/outbound matching connections appear after some hours of work (i.e. I leave it running while I sleep).