Berry bug is when you get 149 from a berry bush not the 150, thus a peon deliveries 9 berries instead of ten.
The problem with this is if you are using 5 peons on berries, production of peons can be delayed having only 49 food waiting for more food.
You can force a peon to delivery earlier but it requires more attention and micro management. Then you must continually manage the peons to deliver. One of the easiest ways to remedey this bug is to add a another villager to the berry patch after your wood pit is built.------------------
He who has the last peon standing, wins!