The facts are always confusing. Moreso when we have to dig a little and get out of what we call our "comfort zone." That was one of the things that John talked about in his second letter. In effect, he said "some of you walk in truth" and "some don't."
He did not actually say "some don't", but that has to be implied from the words "some do." The amazing thing is that he did not harp on the "don't" people. He marched right on with the instructions to keep going the way you "learned." More correctly, he said "keep walking the way you learned to walk" (living the way you learned to live).
It's like a basketball coach who talks to the team at half time and says "You're ahead, just keep shooting and defending like you have been and you will win." In other words, keep doing the right thing!