Varying Variables

Hello,

I am trying to create a slide where by students have to enter answers in multiple numeric entry boxes. If they get the correct answer a tick appears (hidden to normal state).  I wanted to be able to add these ticks up so that the student could get a total mark for that slide. So I tried the following:

Add (variable x) to "total" when the state of "tick" is normal.

The problem I have is that it works for some ticks and not others, I have no idea why, the triggers are exactly the same, the text boxes with the ticks are exactly the same. Any help would be greatly appreciated. 

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