Whays the problem with my deer huntin is my stand to close or what?

this is my second hunt of the year so far an around 5 i see deer walkin acroos the tree line when they get close to the field they look at me an just stare im completelty still but then they dont really bolw they just make a slight blow then trot off my stand is right on the green field ....whats it mean an should i move my stand its a 20ft ladder stand