Unity Interstatial ad giving reward when finished?

I am using Unity Ads and i just realized this. In the Menu scene i have a script for a rewarded ad for energy. I also put an interstatial ad to show when you press the Menu button in a Level Scene(it takes you back to the Menu Scene). But i think the listener from the rewarded ad script hears the interstatial ad finish and gives the reward when it finishes. Is there a way ro patch this?