What happened is your GM is a twit who shouldn't do math when he's had a three day migraine, that's what happened.
Because it was my mistake you can keep the current stock of dry food, but you're correct, you should be getting 2 food units per turn, while consuming 2.2 ...
The female herbalists do not gather their own if there is food to dry. They take excess fresh food and convert it to dry (so if you have 3 food and you're using 2.2, they will dry .75 of that remaining .8.)
If there is nothing left to dry they will collect plants like males, but at half efficiency, as they aren't trained in hunting edibles as well as males are. You aren't actually sure when your children began segregating themselves on sex, as that was not true in the past.
This will happen per female but they will not split their duty; either a female dries .25 food, or she gathers .13 (rounding ha) food.
So currently your standard intake is 2 units of food, but your maximum intake is 2.39 units of food. At this rate, next season you will gain 2.26 units, which means you will only gain 0.06 units of dried food.
Originally the females collected herbs as well and there was no difference, which is why the income was higher. Then I realised they should know at least basic plant drying, but I forgot to remove the appropriate income. Thanks for pointing it out, because that was a mess up on my part from when I was still figuring out how mechanics were going to work, and I never edited it.
Never trust your own numbers, kids. I knew that food level seemed higher than I intended ... Let it never be said I won't admit when I fuck up. :'D
Also, that brings to mind:
Food income in winter depends on severity roll and can range from 0%-50% normal value.
Hatchlings are born in autumn, which means last year's hatchlings will mature and take on jobs in autumn as well.