i already mentioned that if you bought too much, you will have negative red stone, your problem cant fix, because you bought too much, but thats the point of that hack, its like borrowing, if you dont have enough resource to buy, it will let you but of-course it will deduct to your red stone. in order to remove negative red stone. try the rebirth level hack, that is the fastest way to gain red rubies,as far as i know
dont worry too much, you can do that trick even you have negative resources.