Annoying copy-cat neighbors-I mean they copy everything all of the time that I do?

Copy my plants, my garden items, my flowers. Put in a birdhouse, a few days later they have one in the front of their house-same color-same style! They even copy when I take things in if going on a trip. They drive up and down my street-see them a lot. It's a dead end street. They live in back of me. I think it's to snoop and then copy things. It bugs me; it's like why don't they think for themselves. It's like someone copying your answers on a test. I find them annoying and CREEPY too. Something's wrong-with them. I'm not flattered. Something's off. Has this happened to you?