Variable triggers jump to slide

I have set up triggers when a user clicks certain buttons in slides it marks my allocated numbers, 1, 2, 3 and 4 TRUE. 

I have 4 different scenes, and in each one is a button to mark the corresponding numbers to TRUE.

I have a slide set up to navigate to 2.1 when user clicks next button if 1, 2, 3 and 4 are TRUE and to go to 1.2 otherwise.

I can mark 1, 2 and 3 TRUE and goes onto slide 2.1 and doesn't seem to matter about number 4

I have checked all the variables etc and cannot seem to work out what is happening.

Any help would be much appreciated thanks.