How can I disable a group??

Hello

I have a small problem, I am adding reward per level, and the problem is that when activated it gives the reward but it does not stop.

Here I will leave an image for you to see, because I need to create a system that rewards for leveling up.

Thank you very much to all!

I already solved it, since I needed it for when I open a chest, this does not generate the same error.