backing up marcus' observations, as russia in 1.03, i noticed this too- i've never noticed it in any previous patch.
i don't think it's linked to mobilization/demobilization, because i've only mobilized once, and that was about 40 years prior to my current state, and i still have this farmer/laborer thing in the factories.
the odd thing is, it doesn't seem to affect anything. my factories say they're at 100% when they're 4/5, but when i click on it to see why it's 4/5, it's full, but one is a farmer, for example. i haven't been paying that close attention, but i don't think the output is any different.
oh, and my tax rate for all is between 30 and 35%. i do increase my mob pool as often as i can, it's currently at 320 divisions. maybe that has something to do with it??