Just replayed it, and figured out the cause of the bug!
See, when you die, you drop all your firewood in the location you died. But I forgot to update the HUD to reflect that you have zero wood in your inventory.
So the next time you pick up firewood, it will be accurately reflected again.
Ah, ok cool! That would explain why I never saw the issue happen again, must not have noticed the HUD didn't change and quickly grabbed wood before I could.