Didn't have this issue for over 150 hours, so I thought maybe it got fixed. Woke up this morning, and checked the game; enemies were dropping hundreds of wood each, and my bags were all completely full with stacks of 999 wood.

:edit: I did eventually notice it's not *all* maps (maybe it was before). Now it just seems to continue to drop in the map that the quest was for all day, even when the quest is done. So, it's somewhat avoidable, at least.