Sliders / Variables

In the attached file, on each of two slides I have mounted several sliders, each set to address their own variables. I have triggers to add the value of these variables to a total variable, when the next button is clicked.

On the third slide I display the values of these total variables. On preview they both just show zero. 

I think it might be the triggers that are at fault - can anybody shed some light on this?

Thanks!

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