Doesn't sound like you did anything wrong, sometimes this boils down to pure luck.

I hunted out-of-state in early April, and killed 6 birds in 7 days. I hunted the first 5 days of the NY opener, and didn't come close to calling one in, and I've hunted 4 long days here in PA without even hearing or seeing a bird.

I'm convinced that sometimes this all just boils down to fate, good or bad. I wouldn't lose much sleep over it, just keep at it, next year might just be your year to shine.