Either you have a scent issue ( I am not a scent-o-holic, so I think it would have to be a really bad scent issue) or you are in an area that deer are passing through but not living in. A farm I sometimes hunt is not really large enough to hold deer but they pass through going from one woods to another. Could be any number of things but I am guessing scent or over crowding/hunting. I know some of the smaller locations I hunt after about the first week of firearms season you won't see a deer, once they hear all the shooting in the area they lock down and won't come out during the day.