The same thing happened 4 years ago in south Arkansas. We saw nothing. It was like all the deer left or died off. It was unbelieveable! We weren't finding any carcasses so we ruled out a die off. I scaned the internet for several months after the season closed to see if I could find any explanations but none ever turned up. Never did find a cause.
We still dont see the amount of deer we once had although it seems to be getting better each year.

I feel your concern cause I've been there.
Good Luck