I've noticed this issue has been frequently happening to not just me but quite a number of Deaf people (why this seems to happen to Deaf people, I don't know). One way to stop this from happening is to STOP accepting "friends" that you are ALREADY a friend with. Me (and most of the people) will never have a second account, barring any problems with the original account. One of the major reasons this continues to happen because people are STILL accepting friend requests from someone they're already friends with, over and over again. So the people who are doing this, are still doing it.
What you should do is if you notice that you got a friend request from someone you are already friends with, check the original profile and if nothing is out of the ordinary, then chances are the second one is a fake. Inform your friend and then report the fake profile.
Share this with everyone. Thank you.