They probably were just trying to show interest and make conversation and be friendly. I meet people like this often. It has nothing to do with being a Witness. Blame Dale Carnegie. He wrote the book "How to Win Friends an Influence People" which basically taught people to feign interest in others to make friends and start conversation.
What I do when I meet people like this, after answering a question or two, is say "Enough about me, tell me something about yourself" and just turn the conversation around.