Issue with number variable triggering a state change

I've created a slide where it requires users to click on various items to change the state of the on screen next button to appear once they have clicked all the required items. 

There are 9 items to click and when the total hits 9, the state should trigger the button to change from hidden to normal. 

When i preview the slide on it's own it works. When i preview the project, it doesn't appear. 

Anyone any ideas what the issue could be?

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