Logged into Norton Community Forums "AUTOMATICALLY"

Looking at the Norton Forum like I do multiple times a day and all of a sudden I was "Automatically" logged in.  It happened about a week ago, too.  At the time I thought it was SUPER strange, as well.  Thought maybe I did it and didn't realize it.  This time though, just perusing the forum, hands not even near my mouse and POOF --"Automatically" logged in again.  Has this happened to any1 else??

And, "Autofill my logins when I visit websites" is UN-checked.