You only added 1 wood. R to take 1, ctrl+r to take stack. Odds are you just pressed R and took one?

Either way not like mats are hard to get at all. I only have like 9 hours total in this game and pretty much quit playing already because I had like $147, 1 box for each mat type full, more food/water than I would ever need and had basically built my own apartment in the alleyway that was so big I could access the rooftops of the surrounding 3 buildings, could 1 shot entire hordes of enemies with pigeonado and got bored/fed up with the tedious recycling mechanics and never even unlocked all the blueprints for stuff.

yeah iv got the hang of it now, worked out you can put 3 wood in, then 1 scrap at a time, sometimes it works, sometimes doesn't, its a good game but feels a little easy and very tedious lol

good game