As the fall progresses the deer feeding habits change, also some food may not be there year to year. It's possible that the food source in your area dried up and they went elsewhere to feed. Right behind my house is usually a decent spot to hunt, this year its the PITS. We had some sort of oak virus that kept all the oaks from having acorns in this area. Not a single deer to be found, we have snow on the ground now, have for a couple weeks, not a SINGLE track to be found where its usually loaded.