Sounds like your hunting a pretty smart deer.
Wouldn't complain about...Make me want to know who's smarter me or him...
Funny cause I just watched a hunting program,in which a hunter had the same problem as you.
On the last day she finally arrowed a doe but even than, the deer new something was wrong, the hunter just got lucky....
Don't know what to say.Could be scent could also be these deer have been pressured into the hole your hunting and are wary of anything.......
Animals squirrls chipmunks birds do give you away in a situation like this.......
That chirping does mean something,to smart deer...
Its happened to me....
Problem I don't like about stands is prevailing winds..
Could be the fact your scent is circling the entire area your hunting.......
All it takes is one to deer to smell you out and everything around knows it..
I wear leather boots but I use 100% BEESWAX to protect them.....
It works, you may not like the colour boots come out afterwords but
its the most natural protectant I can think of......
I stay away from silicons and other artificial smelling oilsbase protectants
that leave odour behind....