Labor consumption bug

I’ve been restructuring some bases, moving production from one to another. And I’ve come to find that when you destroy a building, for some reason your labor consumes more resources even when you’re at 100%. I wasn’t sure at first so i broke 1 smelter and then broke another and noticed the drop in consumables when I was clearly at 100%. Seems like a bug especially since maintaining consumables is like 95% of the work in this game.