I got this subscription for my wife. The first two books came in very quickly; but even though we chose Horror it came with one horror boo and one phantasy book. Which she won't read.
Wikipedia defines horror as "Horror is a genre of speculative fiction which is intended to frighten, scare, or disgust."
Fantasy has been long considered to be a derivative of Science Fiction, Not horror.
Hopefully this was a mix-up. Because the crate is too expensive if they are not going to give you two books from the genre you chose. In fact, why even ask what genre you want if they are going to give you other genres that you didn't choose.