I do not know where you purchased your BL-Touch. If you got it from Makerfarm, that reduces my concern about it being a counterfeit probe. But Antclabs (the maker of the real BL-Touch probe) is only selling the probe on eBay. They have not set up much of a distribution network. It is very possible MakerFarm thinks they are distributing a legitimate BL-Touch probe but they are not. This is a real BL-Touch probe:
http://www.ebay.com/itm/BLTouch-Auto...4AAOSw9IpXxne9
What I can tell you with certainty is that most of the questions and problems we are seeing with 'BL-Touch' probes are clones and not real BL-Touch probes. Can you post a picture of the probe. And it might not hurt for you to send an email to Antclabs and ask if MakerFarm is an 'Authorized Distributor' of their probe. That would put the question to bed one way or the other.