I agree, if deer are alerting by snorting away from you, there picking up something that is making them nervous enough to sound an alarm!
it could be as simple as the deer are actually watching you enter the woods from where ever they are sitting before you get there
or again, could be there catching your scent
you say your pretty good about your scent, but what exactly does this mean
a deer has an incredible sense of smell
if you clothing or your hands, come in contact with certain things, (like fueling up a vehicle,)
fuel on your boots or hands or clothing can stick even after being washed in a good scent free detergent!
also keep in mind some deer are just a LOT more sensitive to scents than deer in other places
I personally always took great extremes to try and beat there nose
I always showered just before heading out, using scent reducing products, (lots of baking soda too)
and then carried all my hunting gear in scent free containers, and dressed , then spray down with a scent , so called scent eliminator LOL, just before going into the woods!, and if a LONG walk in, would carry some to spray me down again, and I will stop OFTEN to NOT Break a sweat going in!
sweating is like defeating all your work in scent control IMO!
ALL my hunting gear was NEVER ever wore any where but HUNTING, it was kept separate from all other things in a separate room I dedicated to hunting clothing and gear I wanted scent free!
I know everyone cannot do this, but, I will say I seldom if ever got busted by deer, no matter what way the wind was blowing!
NOW< if deer are NOT scenting you
it could be deer are seeing you in your stand, or on the ground, as your NOT stating how your hunting, on the ground or in a stand.
Movement is a number one thing deer notice IMO after scent!
if your in a tree, and you don';t have a god stand site, you will stick out like a sore thumb, same as on the ground, and deer KNOW there area, so things different can get there attention,
add in some odd scents and or a bunch of movements, and you now have very alert deer!
next will be again entering and leaving the area
are deer WATCHING you as you do so!
can you try entering from a different location/way
do you SNEAK into your area or just plain walk in and not pay as much attention as you do< ??
hunting is a skill and like all skills, it takes practice and paying attention to get better, and a endless adaptation to changing your tactic's to be successful
as what worked ONCE might not again, and same with where you hunt, its a never ending game of learning , and trying to BEAT the species your after!
just keep trying
and if your area get a LOT of deer snorting, just it a rest and hunt else where
BUT deer snort all the time, and they WILL come back
its NOT a once they snort they move on else where deal
They spent there lives there, there NOT packing up and moving to a unknown area again
they WILL how ever change how they go into there area, be it at different hours, or in different travel routes thru it
but they DON"T flee a home turf, just due to they snorted at something, or deer would NEVER have a home range
I have killed countless deer, JUST after one deer snorted and then new one's showed up
and have had countless deer in food plots snorting at things behind the tree line and never left the food plot and deer continued to come out !
snorting isn't a done deal when hunting, but you DO want to try and find out WHY there snorting and make adjustments from there!
keep at it, you'll learn as time goes by!