I found a bug with the mod, sometimes when you launch a rocket, the screen vibrating causes your cursor to be bugged. So the crosshairs will be pointing at one block visually but it will really be pointing at another, really hard to build once this happens as half your placed blocks end up in the wrong spot. The cursor basically gets visually offset and stuck. Only way to fix is to restart. Perhaps there should be a config option to disable the screen vibrations