Can't hack school of dragons gems

[EnergyFlow]

So I was trying to hack school of dragons with game guardian, I had 75 gems to start do I did a known search for the value 75 but way too many poped up so i watched a video and got 2 more gems then i refined my search now only 2 poped up I tried them both and 1 of them actually changed the amount of gems just as I wanted but the problem is it won't let me buy in game stuff with the gems, keep in mind the gems are a form of their in game currency but since it didn't let me buy things I  thought I should just close out of everything and restart the game and I did after that I went back into the game and my gems had reset to their original amount that they would be if I hadn't hacked them, so could someone help me figure it out or make a script for or something